Headers are part of the Civic Si's exhaust system. After oxygen and fuel are combusted in the engine, the waste (exhaust) is sent through the headers. From there, the exhaust travels through the catalytic converter, then muffler, then is released into the air. In general, performance headers are good for a horsepower or two by reducing the resistance (or "back pressure") that is inherent in all vehicles built for the road.
For four cylinder engines, there are two basic header flavors: 4-2-1 and 4-1. 4-2-1 headers start with 4 pipes (one for each cylinder), then taper down into two pipes, then finally into one pipe. A 4-1 header has four pipes that taper into one pipe. In general, the 4-2-1 headers are going to give you a little more power in the low end, and the 4-1 headers are going to give you more power in the high end. Some people report having problems with 4-1 headers scraping if their vehicles are too low.
Fortunately, there are a wide variety of headers available for the Civic Si, many of which will add some horsepower, and a nice look to your engine bay. Have a look at these:
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 TRI Y STAINLESS RACING MANIFOLD HEADER EXHAUST 94 01 INTEGRA B SERIES GSR TYPE R $131.99 Time Remaining: 50m Buy It Now for only: $146.99 Add to watch list |
 HONDA CIVIC SI FG2 FA5 K20 STAINLESS STEEL EXHAUST CHROME RACE HEADER+GASKET+O2 $44.98 Time Remaining: 54m Buy It Now for only: $49.98 Add to watch list |
 DC SPORTS HEADER POLISH 02 06 ACURA RSX BASE HONDA CIVIC Si ONE PIECE 4 2 1 $379.95 Time Remaining: 1h 5m Buy It Now for only: $379.95 Add to watch list |
 DC SPORTS HEADER POLISH HONDA 99 00 CIVIC Si 94 97 DEL SOL VTEC ONE PIECE 4 1 $349.95 Time Remaining: 1h 21m Buy It Now for only: $349.95 Add to watch list |
 MEGAN RACING EXHAUST HEADER 88 91 HONDA CIVIC D16 D16A EX EF 2 4 DOOR 4TH GEN $159.99 Time Remaining: 1h 29m Buy It Now for only: $159.99 Add to watch list |
 MEGAN RACING EXHAUST HEADER 92 95 HONDA CIVIC D16 D16A EX EG 2 4 DOOR 5TH GEN $159.99 Time Remaining: 1h 29m Buy It Now for only: $159.99 Add to watch list |
 MEGAN RACING EXHAUST HEADER 96 00 HONDA CIVIC D16 D16A EX EK 2 4 DOOR 6TH GEN $159.99 Time Remaining: 1h 29m Buy It Now for only: $159.99 Add to watch list |
 DC SPORTS HEADER POLISH HONDA CIVIC 92 95 DX LX Si 96 00 EX 93 97 DELSOL 1PC 4 1 $349.95 Time Remaining: 1h 37m Buy It Now for only: $349.95 Add to watch list |
 DC SPORTS HEADER POLISH CIVIC 92 95 DX LX Si 96 00 EX 93 97 DELSOL 2 PC 4 2 1 $364.95 Time Remaining: 1h 43m Buy It Now for only: $364.95 Add to watch list |
 DC SPORTS HEADER POLISH HONDA 99 00 CIVIC Si 94 97 DEL SOL VTEC TWO PIECE 4 2 1 $349.95 Time Remaining: 2h 3m Buy It Now for only: $349.95 Add to watch list |
 CIVIC 02 05 SI EP3 EP FULL STAINLESS CATBACK EXHAUST SYSTEM CAT BACK MUFFLER TIP $99.99 Time Remaining: 2h 16m Buy It Now for only: $109.99 Add to watch list |
 Stainless Black Painted Racing Exhaust Header+15HP $53.99 Time Remaining: 2h 18m Buy It Now for only: $59.99 Add to watch list |
 DC SPORTS RACE HEADER POLISH STAINLESS 06 11 HONDA CIVIC Si ONE PIECE 4 2 1 $424.95 Time Remaining: 3h 40m Buy It Now for only: $424.95 Add to watch list |
 DC SPORTS RACE HEADER CERAMIC K SERIES SWAP CIVIC ACCORD INTEGRA ONE PIECE 4 2 1 $314.95 Time Remaining: 4h 25m Buy It Now for only: $314.95 Add to watch list |
 HONDA D15 D16 D D SERIES STAINLESS STEEL EXHAUST HEADER $53.99 Time Remaining: 4h 55m Buy It Now for only: $59.99 Add to watch list |
 99 00 HONDA CIVIC SI B16 B16A DOHC JDM EXHAUST HEADER $67.99 Time Remaining: 13h 7m Buy It Now for only: $74.99 Add to watch list |
 Integra DC5 Honda Civic SI Tri Y EP3 HYTECH K24 K20 $441.75 Time Remaining: 13h 47m Buy It Now for only: $441.75 Add to watch list |
 88 89 90 91 92 93 94 95 HONDA CIVIC EXHAUST MANIFOLD $125.00 Time Remaining: 14h 6m Buy It Now for only: $125.00 Add to watch list |
 CIVIC CRX DEL SOL SOHC D SERIES CERAMIC HEADER EXHAUST $58.00 Time Remaining: 16h 16m Buy It Now for only: $58.00 Add to watch list |
 Exhaust Header Honda Civic 99 00 SI DOHC B16 Del sol $69.95 Time Remaining: 16h 17m Buy It Now for only: $69.95 Add to watch list |
 RARE COMPTECH ENGINEERING ACURA RSX BASE K20A3 AND CIVIC SI 4 1 HEADER K20 $375.00 Time Remaining: 16h 55m Buy It Now for only: $375.00 Add to watch list |
 Honda Civic 99 00 1999 SI B16 DOHC Performance Header $19.90 Time Remaining: 16h 59m Buy It Now for only: $19.90 Add to watch list |
 93 97 HONDA DEL SOL 98 01 ACURA INTEGRA 4 2 1 HIGH FLOW RACING HEADER VTEC B16 $97.95 Time Remaining: 17h 2m Buy It Now for only: $107.75 Add to watch list |
 Honda Civic Si 20L K20 06 10 Performance Exhaust Header Headers $140.99 Time Remaining: 17h 18m Buy It Now for only: $140.99 Add to watch list |
 4 1 STAINLESS RACING MANIFOLD HEADER EXHAUST 02 05 ACURA RSX NON TYPE S CIVIC Si $24.99 Time Remaining: 17h 24m Buy It Now for only: $27.99 Add to watch list |
 STAINLESS STEEL EXHAUST HEADER 06 11 HONDA CIVIC SI 20 4CYL K20Z3 FG2 FD4 FD3 $59.99 Time Remaining: 17h 33m Buy It Now for only: $65.99 Add to watch list |
 ACURA INTEGRA GSR DC2 93 97 HONDA CRX DEL SOL STAINLESS EXHAUST HEADER+GASKET $38.98 Time Remaining: 17h 57m Buy It Now for only: $42.98 Add to watch list |
 Megan Racing Stainless Steel Header Honda Civic 06 07 08 09 LX EX $129.00 Time Remaining: 18h Buy It Now for only: $129.00 Add to watch list |
 Megan Racing Stainless Steel Header Honda Civic SI 06 07 08 09 $129.00 Time Remaining: 18h 5m Buy It Now for only: $129.00 Add to watch list |
 2002 2005 HONDA CIVIC ACURA RSX SI EP3 DC5 4 1 STAINLESS STEEL HEADER 03 04 $59.99 Time Remaining: 18h 54m Buy It Now for only: $59.99 Add to watch list |
 96 97 HONDA CIVIC EXHAUST MANIFOLD $250.00 Time Remaining: 19h 7m Buy It Now for only: $250.00 Add to watch list |
 96 97 98 HONDA CIVIC EXHAUST MANIFOLD VTEC $125.00 Time Remaining: 19h 8m Buy It Now for only: $125.00 Add to watch list |
 88 89 90 91 92 93 94 95 HONDA CIVIC EXHAUST MANIFOLD $75.00 Time Remaining: 19h 9m Buy It Now for only: $75.00 Add to watch list |
 88 91 HONDA CIVIC HATCHBACK CATBACK+HEADER+MUFFLER EF $170.00 Time Remaining: 19h 43m Buy It Now for only: $188.00 Add to watch list |
 D15 D16 STAINLESS STEEL PERFORMANCE HEADER PIPES 88 00 HONDA CIVIC DX LX EX $68.99 Time Remaining: 19h 44m Buy It Now for only: $75.99 Add to watch list |
 TRI Y HEADERS 94 01 INTEGRA GSR TYPE R 99 00 CIVIC SI $133.00 Time Remaining: 19h 46m Buy It Now for only: $146.50 Add to watch list |
 HONDA 88 00 CIVIC EF EG EK HB D15 D16 EX LX DX CX EXHAUST HEADER+PIPE SOHC $82.00 Time Remaining: 20h 18m Buy It Now for only: $91.00 Add to watch list |
 88 00 HONDA CIVIC PERFORMANCE HEADER Polished $46.99 Time Remaining: 20h 50m Buy It Now for only: $46.99 Add to watch list |
 88 91 HONDA CIVIC SI EX LX DX DC S 4 2 1 EXHAUST HEADER $22.99 Time Remaining: 21h 33m Buy It Now for only: $25.29 Add to watch list |
 CIVIC SI b16 b16a 99 00 JDM 4 1 DOHC STAINLESS HEADER $64.98 Time Remaining: 21h 34m Buy It Now for only: $71.98 Add to watch list |
 HONDA 88 00 CIVIC EF EG EK HB D15 D16 EX LX STAINLESS STEEL EXHAUST HEADER SOHC $55.00 Time Remaining: 21h 42m Buy It Now for only: $61.00 Add to watch list |
 96 97 HONDA CIVIC EXHAUST MANIFOLD $155.00 Time Remaining: 21h 57m Buy It Now for only: $155.00 Add to watch list |
 JDM 4 2 1 HEADER 92 00 CIVIC D SERIES ENGINE D15 D16 $68.98 Time Remaining: 22h 18m Buy It Now for only: $75.98 Add to watch list |
 Stainless Steel Header EP3 Civic 02 03 04 05 SI L4 20L $9.99 Time Remaining: 22h 33m Buy It Now for only: $13.99 Add to watch list |
 OBX Exhaust Header 02 05 Honda Civic Si SIR K20 A3 EP3 $224.99 Time Remaining: 22h 36m Buy It Now for only: $224.99 Add to watch list |
 INTEGRA CIVIC B SERIES STAINLESS STEEL EXHAUST HEADER $92.35 Time Remaining: 22h 39m Buy It Now for only: $92.35 Add to watch list |
 Honda Civic Integra 99 00 SI B16 DOHC Exhaust Header $31.50 Time Remaining: 22h 40m Buy It Now for only: $36.50 Add to watch list |
 OBX Long Tube Exhaust Headers 06 09 Honda Civic Si 20L $235.00 Time Remaining: 22h 45m Buy It Now for only: $235.00 Add to watch list |
 94 01 ACURA INTEGRA GSR DC2 HONDA CRX DEL SOL B16 B18 STAINLESS EXHAUST HEADER $36.98 Time Remaining: 22h 54m Buy It Now for only: $40.98 Add to watch list |
 Stainless 4 1 1pc Steel Header Civic EP3 02 03 04 05 SI $49.95 Time Remaining: 22h 58m Buy It Now for only: $58.95 Add to watch list |
 JDM Exhaust Header Civic Integra 1999 2000 SI B16 DOHC $10.99 Time Remaining: 22h 58m Buy It Now for only: $17.99 Add to watch list |
 Stainless Steel Header T4 Manifold Civic 02 03 04 05 SI $77.95 Time Remaining: 23h 17m Buy It Now for only: $99.95 Add to watch list |
 Stainless Steel Header K20 RSX 02 03 04 06 Non Type S $9.99 Time Remaining: 23h 38m Buy It Now for only: $13.99 Add to watch list |
 02 05 CIVIC SI EP3 02 06 RSX NON TYPE S STAINLESS STEEL 4 1 EXHAUST HEADER $29.99 Time Remaining: 1d 9m Buy It Now for only: $32.99 Add to watch list |
 STAINLESS STEEL EXHAUST HEADER MANIFOLD+N1 MUFFLER HONDA D SERIES ENGINE EK9 EG $108.99 Time Remaining: 1d 41m Buy It Now for only: $119.99 Add to watch list |
 INTEGRA GSR TYPE R DC CIVIC SI EM 4 1 HEADER EXHAUST $58.00 Time Remaining: 1d 52m Buy It Now for only: $58.00 Add to watch list |
 STAINLESS STEEL EXHAUST HEADER MANIFOLD+RADIATOR HONDA D SERIES ENGINE D16 D15 $79.99 Time Remaining: 1d 1h 30m Buy It Now for only: $87.99 Add to watch list |
 99 00 HONDA CIVIC SI 94 97 DEL SOL SI SS EXHAUST HEADER $60.00 Time Remaining: 1d 1h 42m Buy It Now for only: $60.00 Add to watch list |
 CERAMIC RACING MANIFOLD HEADER EXHAUST 88 01 CIVIC CRX DEL SOL SOHC EX D15 D16 $27.99 Time Remaining: 1d 2h 14m Buy It Now for only: $27.99 Add to watch list |
 4 1 STAINLESS RACING MANIFOLD HEADER EXHAUST JDM INTEGRA GSR TYPE R CIVIC SI B18 $27.99 Time Remaining: 1d 2h 14m Buy It Now for only: $27.99 Add to watch list |
 4 1 STAINLESS RACING MANIFOLD HEADER EXHAUST 02 05 ACURA RSX NON TYPE S CIVIC Si $27.99 Time Remaining: 1d 2h 14m Buy It Now for only: $27.99 Add to watch list |
 HONDA 99 00 CIVIC SI JDM POLISHED S S 4 1 RACING EXHAUST HEADER $67.99 Time Remaining: 1d 2h 17m Buy It Now for only: $74.99 Add to watch list |
 4 2 1 STAINLESS RACING MANIFOLD HEADER EXHAUST CIVIC CRX DEL SOL SOHC D SERIES $32.99 Time Remaining: 1d 2h 18m Buy It Now for only: $32.99 Add to watch list |
 STAINLESS RACING MANIFOLD HEADER EXHAUST 06 09 HONDA CIVIC SI K20Z3 KA20Z3 FG2 $34.99 Time Remaining: 1d 2h 18m Buy It Now for only: $34.99 Add to watch list |
 84 85 86 87 HONDA CIVIC EXHAUST MANIFOLD $50.00 Time Remaining: 1d 2h 23m Buy It Now for only: $50.00 Add to watch list |
 88 89 90 91 92 93 94 95 HONDA CIVIC EXHAUST MANIFOLD $50.00 Time Remaining: 1d 2h 26m Buy It Now for only: $50.00 Add to watch list |
 88 89 90 91 92 93 94 95 HONDA CIVIC EXHAUST MANIFOLD $50.00 Time Remaining: 1d 2h 30m Buy It Now for only: $50.00 Add to watch list |
 88 89 90 91 92 93 94 95 HONDA CIVIC EXHAUST MANIFOLD $35.00 Time Remaining: 1d 2h 31m Buy It Now for only: $35.00 Add to watch list |
 STAINLESS MANIFOLD HEADER+DOWNPIPE TRI Y EXHAUST 06 11 HONDA CIVIC Si FA KA20Z3 $143.98 Time Remaining: 1d 2h 33m Buy It Now for only: $159.98 Add to watch list |
 96 97 HONDA CIVIC EXHAUST MANIFOLD $125.00 Time Remaining: 1d 2h 36m Buy It Now for only: $125.00 Add to watch list |
 4 2 1 SOHC D Series D16 D17 Stainless T304 Steel header $64.99 Time Remaining: 1d 5h 4m Buy It Now for only: $64.99 Add to watch list |
 CIVIC SOHC D Series 4 2 1 Stainless T304 Steel header $64.99 Time Remaining: 1d 5h 4m Buy It Now for only: $64.99 Add to watch list |
 SOHC Engine D Series 4 2 1 Stainless T304 Steel header $64.99 Time Remaining: 1d 5h 4m Buy It Now for only: $64.99 Add to watch list |
 Skunk2 Mega Power Stainless Steel Exhaust Header 06 11 Honda Civic Si K20Z3 $796.99 Time Remaining: 1d 6h 29m Buy It Now for only: $796.99 Add to watch list |
 Skunk2 Mega Power Stainless Steel Exhaust Header Acura Honda K20A2 K20A3 K20Z1 $796.99 Time Remaining: 1d 6h 29m Buy It Now for only: $796.99 Add to watch list |
 Skunk2 Mega Power Stainless Steel Exhaust Header Acura Honda B Series Engines $796.99 Time Remaining: 1d 6h 29m Buy It Now for only: $796.99 Add to watch list |
 Skunk2 Mega Power Stainless Steel Exhaust Header Acura Honda K Series Engines $796.99 Time Remaining: 1d 6h 29m Buy It Now for only: $796.99 Add to watch list |
 96 97 HONDA CIVIC EXHAUST MANIFOLD $274.99 Time Remaining: 1d 11h 36m Buy It Now for only: $274.99 Add to watch list |
 96 00 HONDA CIVIC 2 4DR STAINLESS STEEL EXHAUST HEADER $53.99 Time Remaining: 1d 13h 40m Buy It Now for only: $59.99 Add to watch list |
 Exhaust Header Civic Integra 1999 2000 99 SI B16 DOHC $10.99 Time Remaining: 1d 13h 59m Buy It Now for only: $17.99 Add to watch list |
 Pacesetter 72C1144 Headers Armor Coat Honda Civic CRX $263.00 Time Remaining: 1d 15h 12m Buy It Now for only: $263.00 Add to watch list |
 96 00 HONDA CIVIC 2 4DR STAINLESS BLACK EXHAUST HEADER $53.99 Time Remaining: 1d 16h 46m Buy It Now for only: $59.99 Add to watch list |
 JDM 4 2 1 HEADER FOR 92 00 HONDA CIVIC D SERIES ENGINE $68.98 Time Remaining: 1d 16h 49m Buy It Now for only: $75.98 Add to watch list |
 OBX SS304 TRI Y HEADER HONDA CIVIC SI K20Z3 FG2 FA5 $235.00 Time Remaining: 1d 17h 16m Buy It Now for only: $235.00 Add to watch list |
 Performance Header Civic EP3 2002 2003 2004 2005 SI 20 $49.95 Time Remaining: 1d 17h 42m Buy It Now for only: $58.95 Add to watch list |
 Pacesetter 72C1149 Headers Armor Coat Honda Civic DX LX $263.00 Time Remaining: 1d 17h 44m Buy It Now for only: $263.00 Add to watch list |
 Pacesetter 72C1160 Headers Armor Coat Honda Civic EX $263.00 Time Remaining: 1d 17h 48m Buy It Now for only: $263.00 Add to watch list |
 Pacesetter 72C1165 Header Armor Coat Honda Civic Si 16 $256.00 Time Remaining: 1d 17h 57m Buy It Now for only: $256.00 Add to watch list |
 DC SPORTS CERAMIC HEADER 92 95 HONDA CIVIC DX LX EX SI $312.60 Time Remaining: 1d 18h 55m Buy It Now for only: $312.60 Add to watch list |
 DC SPORTS POLISHED HEADER 92 95 HONDA CIVIC DX LX EX SI $372.31 Time Remaining: 1d 18h 57m Buy It Now for only: $372.31 Add to watch list |
 1992 1995 HONDA CIVIC DX LX EX T 304 EXHAUST HEADER 94 $53.99 Time Remaining: 1d 20h 12m Buy It Now for only: $59.99 Add to watch list |
 DC SPORTS HEADER CERAMIC 94 97 HONDA DEL SOL VTEC 99 00 CIVIC Si ONE PIECE 4 1 $289.95 Time Remaining: 1d 20h 13m Buy It Now for only: $289.95 Add to watch list |
 CIVIC CRX DEL SOL SOHC D15 D16 PERFORMANCE STAINLESS STEEL RACE HEADER+EXHAUST $64.99 Time Remaining: 1d 21h 2m Buy It Now for only: $71.99 Add to watch list |
 DC SPORTS CERAMIC HEADER 92 95 HONDA CIVIC DX LX EX SI $296.14 Time Remaining: 1d 21h 52m Buy It Now for only: $296.14 Add to watch list |
 DC SPORTS POLISHED HEADER 02 05 HONDA CIVIC SI $387.65 Time Remaining: 1d 22h 2m Buy It Now for only: $387.65 Add to watch list |
 EP3 Civic 2002 2003 2004 2005 L4 20L SI Exhaust Header $27.50 Time Remaining: 1d 22h 20m Buy It Now for only: $30.50 Add to watch list |
 OBX Exhaust Headers 06 08 Honda Civic 18L DX LX EX NEW $250.00 Time Remaining: 1d 23h 18m Buy It Now for only: $250.00 Add to watch list |
 DC SPORTS POLISHED 4 1 HEADER 92 95 CIVIC DX LX EX SI $354.72 Time Remaining: 1d 23h 58m Buy It Now for only: $354.72 Add to watch list |
 DC SPORTS CERAMIC 4 1 HEADER 99 00 HONDA CIVIC SI $296.14 Time Remaining: 2d 4m Buy It Now for only: $296.14 Add to watch list |
 DC SPORTS POLISHED 4 1 HEADER 99 00 HONDA CIVIC SI $354.72 Time Remaining: 2d 5m Buy It Now for only: $354.72 Add to watch list |
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