Quote:
Originally Posted by exxit
Mine leaks to all hell but the car is tuned so I don't get a CEL.
I think the only way to get that area to seal right is to use a packed clamp like GM did. Shit design, shit decision. I'm like | | close to having my builder setup a flake setup and weld a set of flanges to my stock cats too. I love that my build can go back to stock very easily and would like to keep it that way.
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I did use a packed GM clamp and still leaked. The issue is the "ridge" or "lip" if you will on the test pipe is larger diameter then the lip on the cat back. you are suppose to get these two "ridges" or "lips" to the point where the meet and then put the GM clamp around it and torque it. I think my issue was that these were for a ZL1 and the diameter is larger(only in the slip section). I am assuming the ZL1 cat back is 3" judging by the slip or else it was simply just made incorrectly. I could not get enough clamping force on the cat back side.
Fwiw I bought these pipes slightly used from a Vendor that said they were for a 6 gen Camaro. So I had no idea until I already had the exhaust apart that the driver side was not correct. I had to modify the driver side to make it work. Passenger side no issue... I then contacted vendor who said they came off of a ZL1. I told them I made it work, but then after some driving I started noticing the leak.
However it sounds like all of these bolt-in test pipes leak on the driver side so I am done with them. I will probably end up going with headers at some point. From what I read Dynatech will bolt up to the factory NPP without cutting. I don't feel like dumping 3k into a full exhaust even though it will sound the best this way.