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Originally Posted by zpeed
My brother have HKS Muffler sit in the garage. Should he just put on the Muffler and go auto-x this weekend? Or wait til he got more $$ then order the TurboXS Stealth Back with the same Muffler.
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The restriction is at the axle, where it drops from 2.5" to 2" for no reason. So unless it is at least axle back, don't bother putting it on, it is unlikey to do anything. You need a John Evans special straight cat-back...
There are also some real good options having a custom cat back made if you have a high flow muffler.