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Thinking about putting these on my NA1. I have stock exhaust manifolds, cats with a Comptech cat back exhaust....


Question for those of us in AZ who have to deal with emmissions:

 

1) Do these bolt on to the stock cats?

2) Is it worth it or should you upgrade to a high flow cat? If so what kind?

3) Will it still pass emmissions with high flows?


Other suggestions?


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