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Hello, I have on my ISf, Borla Axle back exhaust. And I want to delete secondary cats and maybe resonator! what do you think about it? or maybe someone did it already.
 

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I have my rear cats removed and it sounds great. I have dual flowmaster 40 series with the removed cats and a 6 inch magnaflow resonator. With the resonator out its crazy loud and it adds alot of sound and growl to the high Rpms. I got a headache from the crazy amount of drone and sound so I had a smaller magnaflow resonator put on.
 
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