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Resolved 2G Downpipe to stock cat?

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yeahfoshobro

Probationary Member
2
0
Jan 17, 2024
Thousand Oaks, California
Hey I was looking into buying a STM 3” Downpipe for stock o2 housing and was wondering if it would bolt up to the stock cat or would I have to get a test pipe? I do have a 3” cat back from HKS.
Thanks!
 
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