LOL- that small muffler is the "cat".
Im not sure what you originaly thought was a cat, but that may be the headers...
And that line from my intake is a vacume line.
2.25 inches IIRC, maybe 2 inches.
Bottom line is its too small.
Heres my non-turbo intake/exhaust set up!
Just disregard everything else in that pic. Dirty and rusty! Much better/polished now!
HKS has YEARS of reasearch and development behind it. YEARS.
Keep the HKS.
The only thing that the other exhaust would do it make a loud noise.:nono:
Keep the HKS and don't look back.
Im actually not sure at all. I have a test pipe on my n/a and it bolted right up, and i have a after market exhaust from there back. I would see no reason as to why it wouldn't bolt up, and ive heard of people putting some gaskets to make it fit.
Or just hollow out your cats! Its free and...
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