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I run 3 inch trues with just hi flo cats that i bought from summit and couldn't be happier. Has a nice deep tone at idle with a little cackle at hi-rev. Dont know about power gain but it gives me a little more throttle response.
Yeah sry for not responding but am going with no cat 3 inch true duals with h pipe,and am going to run flowmaster 44s with turns downs andrun some mid lenght or long tube headers.Am looking to get a 20 hp gain and aleast 15 tq out of the 1 grand worth of stuff going into the pig.