I'm running Kooks LT's with high flow cats and Solo's Mach XL catback. Before my cam it was done free. After my cam I'm playing with the J pipes to get rid of the last of the drone. It cruises quiet as a church mouse on the highway, but step on it and it is beastly. The only place it has some drone left (again, I've almost got that tuned out) is about 1,200 rpms. A little more tweaking and it will be gone.
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