^^What is happening is ARK designed the Exhaust with Stock Cats, The Increased Exhaust flow due to the test pipes is to much for the X pipe section thus creating a loud howl wistling noise. Which is the reason I sold mine soon after purchase, Because I was not going to take off the Test Pipes.
Note the exhaust will sound just fine with the stock cats, only when use of Test Pipes will it make this loud howl,wistle noise.
DAN
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-My BRZ with exhaust will decimate all if we overnight parts from Japan-
10 Civic EX Sedan- Current Daily
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