Rep Power: 0

I drive a 03 SI
I just installed a dc ceramic header into mty car, i also have a CAi injen intake. After i installed my DC header, i noticed a considerable drop in TQ. Is this normal to see?? do i gain any thing from installing the headers like HP gain? cuz i dont feel any. Ne of you guys out there have ever experienced this? Im thiniking of puting back my stock. is this a good idea. or any ideas how to get my Tq back?

Thanks guys

oh yea i found this at an import tuner webside, looks like the same happened to this car too.

http://www.importtuner.com/tech/0307it_ppcivic/

 
Rep Power: 0

The thing you have to remember is that you are dealing w/ a car that is built as a "system".
Everything works within this system and without changing severval components at the same
time that work as a new system, you can experience adverse effects. One reason I have held off adding bolt ons that claim a 10+hp gain....best bet is to save the bills and buy into a turbo/ supercharger system. My thought is turbo, you can stay out of it when you want--its there when you want it.

 
Rep Power: 0

JulesCivic is right ... Honda set up the stock system to work in tandem with each other. while you may have increased peak power at the top of the power band, you may have lost power down low.

this topic has been discussed in great detail on ephatch. the general thinking is since you have helped increase air flow on the exhaust side, exhaust gas speeds slow down because you have the same amount of air flowing either through a larger diameter piping or a less restrictive system (i.e. aftermarket header). if the air flow slows down, the exhaust gases aren't fully exiting the cylinder at lower speeds, therefore hurting low-end torque. there was one Web site with a really good in-depth discussion of the myth of backpressure, but i can't find it now.

otherwise, here is a good read on the myth of backpressure:
http://www.uucmotorwerks.com/html_pr...torquemyth.htm

EDIT:

here is another good discussion on backpressure:
http://www.honda-tech.com/zerothread?id=138153