Exhaust?

[jamin87ss]

My AT4 came with  the optional cat back, is it a Borla? Corsa?  And what cold air are u guys liking? 

[OnTheReel]

Borla.

 

I have the Roto-fab intake coming Friday. Will report back with some before & after testing. Already have the GM cat-back. The exhaust gives the majority of the gains so I’m not expecting much from the intake but we will see.

[brendon444]

What is the difference with the exhaust? 

 

Its already running large diameter pipe. Is it just a free flowing muffler? 

[OnTheReel]

No resonators, no flapper valves, smaller, freer flowing muffler.

[brendon444]

14 minutes ago, OnTheReel said:

No resonators, no flapper valves, smaller, freer flowing muffler.

Hoping for the same gains cutting out muffler + flappers and adding performance muffler 

[Jricharc]

9 hours ago, brendon444 said:

Hoping for the same gains cutting out muffler + flappers and adding performance muffler 

What muffler are you going to run?

[brendon444]

2 hours ago, Jricharc said:

What muffler are you going to run?

Dyno max #17517 

Or

Magnaflow 12909