hcivic0120

I have a 01 civic ex with a cat-back exhaust, header, and intake, would putting a test pipe, make the car sound like crap or will it pretty much keep the same sound but just louder? is there any real hp gains? and last wheres the best place to get one from, like ebay or buy a hi-flow from a online performance store? thank you!

jeffsta17

iTrader: (9)

hp gains are gonna be so small you wont feel it, like 1hp best. I have a hi flow cat from dezod, its the random tech cat. it made my exhaust deeper during low RPM's but higher RPM's sound ricey which annoys me.

D3xn2o

Test pipe = MIL ....... aka Malfunction Indicator lamp....... or CHECK ENGINE!

ya you'll get a code for catalyst inefficient..... which robs you of power..... unless you get a Sim for the rear o2...... which i haven't perfected yet but I kno someone must of they do sell them......

civic_04

i first had a catback, intake, and header, later on i added a hi flow cat and most of my friends said my car sounds better with it, i can tell its alot louder at higher rpms, check engine light always stays on