swerv0428

As some of you know i recently had the resonator removed. When i was talking with the owner of the exhaust shop he said that based on what i was looking for (a little more sound) he would take the 2 cat off as well as the resonator. I didnt want to rush and hack off everything.
So my question is....what are opinions on removing it? It sits behind the O2 sensor so there shouldnt be any problems with throwing codes. What are your thoughts?

prince_bigd

As long as it's after the o2 sensor it should not affect any reading. if you live in a state that tests then Idk if you'll pass. Here in KY there is no inspection so I plan on removing the 2nd cat and replacing the resonator with a vibrant or magnaflow resonator and swapping the stock muffler for a borla or cherry bomb vortex

swerv0428

No testing in florida and i aint moving. Im looking for a little more sound. I cant justify the cost of a cat-back and i havent been impressed with the sound of an axle-back

prince_bigd

yeah removing ths second cat will def give more sound. Idk our flow rates for these ecotecs yet but our stock piping looks small and convoluted. I plan on going to 2 1/4 from behind the secondary O2 all the way back. Go too big and you'll end up killing the scavenging effect that some backpressure provides

swerv0428

Thanks. Anyone else. Opinions?

oneton

Am I missing something, Where is the 1st cat & 2nd cat is this on a SS or all HHR's 2.2 2.4 2.0

swerv0428

Nope from what i know there are two. One main and one smaller cat. Supposedly for cali emissions from what im told. This is on my 2.2

oneton

Thanks, I did not think of the land of fruits and nuts and there emissions!

swerv0428

swerv0428

Anyone else wanna chime in.