egycasper

i have a civic 92 and i swaped a d15b sohc vti 3 stage 130 hp...i put an air intake and a new sport headers for honda& i enlarged the exhaust pipes but i didn't change my exhoust i still didnt feel any change over 130 hp,any way i do 0 to 60 m/h 8 s, do any 1 know why i don't feel any change ?

ironlung78

its getting more air in, and partially out, but the factory exhaust is probably acting like a clogged drain where it all can't escape..

besides, mild bolt ons like you added won't really add noticeable power

RJwaggs

Also, if you read hte sticky at the top of this section (I believe it's this section) you will notice that under the cons of the D series engine, it says they don't respond well to bolt ons. That would be my guess as to why you would not feel the difference.

Maybe if you do some more upgrades and you increase horsepower substantially, the intake and headers may make a bigger difference, but with the engine still being operated under normal circumstances with no difference in aggresiveness, they are probably doing nothing for you.