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I have the Borla Catback, love it. Not sure if it's any better or worse than any other track exhaust. The Joe-Z has some proven tested numbers by members here. I refuse to put my car on a Dyno, sorry.

It was a pain in the ass to install, I had to go back to the shop twice and it had to be spot welded to the thingamajigger because it would get hot and start rattling. I could not tell you if this is due to a poor installer or poor quality control, but it sounds MUCH better than the stock exhaust. MUCH louder. Coupled with the K&N intake I would turn heads at 3000rpm, higher than that and it roars like no other.
 

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The exhaust fills the gap where the intake cannot. WOT is dominated by k&n intake roar. Low rev is where the exhaust comes in. If you live in a cold climate, cold starts are excessively loud with the Borla.

I keep sport mode on, the drone can be irritating at times.
 
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