Hello, I am looking for a Catback Exhaust System? I Have 2013 Yukon Denali XL. I have the complete Airaid System (not installed yet). I am ordering American Racing Headers (Haven't decided if I'm going with cats or not) and hope to get tuned by Black Bear. I am looking for the catback system that provides the most power?

 

with a cat back system, it's basically just a supporting mod as is the aftermarket intake. anything with a free flowing muffler will be best. you will get the most gain with the tune and LTs. I wouldn't be set on looking for the MOST horsepower out of a muffler

I would suggest magnaflow because of quality and price.

 

Can't say for sure which is the "most powerful" but if I were to buy a catback tomorrow I would likely purchase one of these from Stainless Works. They utilize dual 2.5" S-Tube mufflers which are essentially a straight through design. My friend had them on his CTS-V and they sounded mean at WOT and somewhat tame cruising (kinda like Corsa). With LT's they may be too loud for your taste. They offer 2 connection types, one for a factory connection that connects to your factory Y. The second is called a performance connection which is basically true duals minus the Y-adapter that connects to factory Y.

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Chevrolet Trailblazer 5.3 V8 Stainless Works true dual exhaust TBSSTD-LMF-CB- Done Part 2 - YouTube

 

Thank You. The stainless works is very nice, unfortunatly there is none listed for my XL. I also noticed that the factory exhaust diameter is pretty big, 3 1/2 inches I think. I think corsa is 3". Is there an aftermarket 4" single catback out there?