my friend made a custom test pipe n it makes a loud noise wen ur n the car like its rubbing something or hitting sum thing n we check but its nothing we dk wats the problem

 

i had a 99 si civic, dc header, tp, factory pipes and resonator, with a fart-can out the back. IMO cleanest note ive ever herd come from a civic. all the cat did noise wise was lower the sound levels. the factory resonater does a pretty good job at eliminating the rasp

 

its $80 do it....if you don't like it resell it....its will probably give you more hp then your header & exhaust combined or about the same its the most restrictive part of the exhaust

 

I agree.

I have the 70mm Invidia tp and the 70mm V3 catback, I LOVE the sound, and people always tell me it sounds SICK. Wouldn't change it for anything. Oh and the TP will help eliminate drone if you have a CB already.