Alright i got my hooker catback on my car now for about a month and an half. The thing that im noticing is that it really rumbles like a **** at idle when it cold. But when it warms up the rumble seems to go away at idle. I just wish i could get it to stay cause that rumble is so f'ing sweet. anyone else notice this or knows what causes this ???

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1988 Camaro SC
Black w/ Gold GFX
165,000 and still rollin
305 tbi stock execpt open KN
Hooker Cat Back
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going into closed loop may be cutting down on the amount of fuel

 

Most mufflers are the other way around, like Flowmaster for ex. is better when u drive for a while especially after its been broken in.

 

When you first start you car does it idle a little high like normal to warm up, this is most likely causes the increased noise, but once the motor is warmed up and has the low idle, it does get quiet.

 

i get my lope and rumble from a low idle. like when the car idles so low its about to die, that low. it does nothing for performance, but thats just what i noticed (low idle-lope)