I ended up with the Dyno Max Turbos on my convertible Cutlass running a stock 350, manifolds and a 2-1/2” kit to the bumper. I tried the cheaper Borla which I belive are the XS, Magnaflow & Flowmaster and all had a untalerable amount of drone between 30-40MPH.
I’ve had a chance to hear the exhaust of several of the Stielow builds. I think in the older builds he’s used Stainless Works & Borla XR1’s. I was shocked how quite the XR1’s were at idle and at cruising speeds but at WOT they screamed.
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