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Discussion Starter #1
I think the stock TT supra comes with 2 cats (primary and secondary). Now since I have an aftermarket exhaust with dp (no cat). If I get a dp with a high flow cat on there, would it pass emission testing?

btw, this is for NY

I just wanted to know before I go spending money on another dp with high flow cat on there if I'm not going to pass.

Thanks!
 

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Supra TT Senior
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1,887 Posts
It would probably be cheaper to just find a used stock downpipe and swapping it in for the test.

A high-flow cat should technically pass but I'm not sure. It might depend on how strict the state is.
 
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