[staples87]

Originally Posted by Can'tHave2MuchHP

I know all of the differences.

So with Corsa you have two types of Axle Backs and each axle back has tip options. You also have ONE X Pipe option.

Axle Backs:
Sport - 14786 (Sport mufflers are a bit more)
Xtreme - 14784 (Louder and a bit cheaper)

X Pipe - 14788: (3", 2.75" neck in the back. Bolts to primary cats and deletes secondary cats - no check engine light, no errors, worth a few HP and adds some sound)

Cat-backs: The Cat-backs are MERELY a COLLECTION of the above X Pipe and Axle backs bundled together.

Sport Axle Back + X Pipe = "Xtreme" (Adding the X pipe to the sport makes it "xtreme") (You'll notice, this system has the same margin, a bit more expensive due to Sport mufflers)
Xtreme Axle Back + X Pipe = "Xtreme+" (Adding the X pipe to xtreme adds the "+")

There are no resonated or non resonated options. There's only 2 axle back options and 1 X pipe option. Combining the "quieter" Sport mufflers/axle back with the X pipe makes it Xtreme sound level. While combining the "louder" Xtreme mufflers/axle back with the X pipe makes it Xtreme+ sound level. It's actually very simple but the first bit of lingo can be confusing.

With the ZL1 1LE (ZLE) you have to be careful with exhaust choice as 6th gear is shorter than in the regular ZL1 and the cruise I believe is around 2000-2500 RPM. If you get exhaust that has ANY tendency to drone, it will definitely annoy the hell out of you/your passenger(s) every time you're on the highway. If you do not care about drone, then the market is open. If you go AWE and you don't want drone, then you'll want to get the resonated touring setup.

I am a Corsa advocate, but I know the AWE system is nice as well. I wouldn't hesitate to use either. With the Corsa cat-back setup, you're getting ZERO drone no matter the conditions, and the best cruising manners possible (just like stock). The sound is seriously music. I run a Xtreme+ cat-back and on WOT it is thunderous, downshifts snap and pop, burble on gentle acceleration. Quiet cruise, no drone, foot controlled sound.

Hope this helps!

Invaluable information right here! It seems when you get rid of those secondary cats, the pitch of the exhaust is a little higher and raspier on the Xtreme+ setup. What are your thoughts on it?