Hey all.

I have a GReddy TI-C single cat back exhaust with my stock cat punched out. It sounds good at high rev's but anything before that it drones like hell.

Will a high flow cat get rid of the drone?

Thanks.

 

not really i have skunk2 with hfc and it drones like no other. you are better off with a test pipe.

 

Ya a test pipe will pass the resonance noise cleanly through, it will still be loud as shit but it will be behind you instead of under you.

 

I didn't think there would be much difference between a punched out stock cat and test pipe? They are essentially the same thing.

Having said that, I do have an Invidia test pipe sitting around some where that I bought and never put on.

 

Put that test pipe on.

 

It will get rid of some. I switched from a test pipe to a HFC and the sound didnt change much. A HFC sounds more like a test pipe than an OEM cat.

 

It probably won't get rid of the drone; just change its characteristics, generally for the better.

 

I just got a 3'' berk header back /w HFC and it drones at certain RPM, i think its just the way it is

 

it certainly wont eliminate all of it but it could help alot
i dont have your exhaust i run invidia dual n1 and after i added 70mm berk HFC it deffinitly reduced it some.

 

Thanks for the info.

I'm reluctant to run a test pipe as the fine for having one over here is very hefty.