[ST1LE]

Originally Posted by Smokin19

If it's just the sound you are after install an axle back exhaust and call it a day. No retune will be necessary and you keep your warranty.

This is what you should be doing, for sure.

[L78toLT1]

Originally Posted by ST1LE

This is what you should be doing, for sure.

If sound is all you're after, this is definitely the way to go. On an otherwise stock car, headers WITH a tune may be worth 10 - 15 whp. Without a tune it's probably a wash whp wise at best.

[KingLT1]

Originally Posted by s346k

yes. a friend of mine has put 20k? miles on his car with cai intake, kooks long tubes, cats and no tune. no cel, no issues. also no hp gain as that car ran door to door with mine when mine was stock.

i still do not understand why anyone would spend the time and money on those parts, only to utilize the factory tune and ultimately end up with a car that still performs at a stock power level. *he bought the car with those mods.

This...these cars use a torque-based ECU. headers will reach the factory torque limits of the ecu and it will close the throttle some to keep the torque in check. So, you gain nothing for power until you tune.

[wang0528]

Thank yall for the info

[wang0528]

i dont care too much about the power gain and I don't wanna mess up the AFR or the engine...but it would cause a CEL if i change the headers?

[KingLT1]

Originally Posted by wang0528

but it would cause a CEL if i change the headers?

It will if you don't install cats.

[wang0528]

damn, maybe it is not worth it