In case you wanted to know...
I dynoed my car at last years and this years G7 in atlanta. Last year with all mods below except the headers/y-pipe/cutout/new plugs/wires I got 285 RWHP, 304 TQ.

Since then I added the AS&M headers, RT y-pipe and cutout.

WIth cutout open at the y-pipe:
RWHP 298.0
RWTQ 317.6

With cutout closed:
RWHP: 298.8
RWTQ: 315.7

WIth HPP programming (I added because I was desperate to try and break 300 RWHP, I have had it for years for gears, fans but never added the power programming)

With HPP and cutout closed:
RWHP: 303.1
RWTQ: 321.4

With 15% loss that comes to 356 HP and 378 TQ at the crank. I guess I'm pretty happy with it for the mods I have. Now about that blower...
Pat

 

Good numbers for just bolt ons!
I'm suprised to see the HPP make more torque...guess I just don't trust them.
Did you use a wideband on your pulls? What was the a/f ratio?

 

Good numbers. Typically 10-12% loss is closer for our M6 cars.

 

Nice numbers! Once again dyno numbers prove that the 2OTL is one of the best catbacks out there

 

Sorry no A/F, would have been nice. I was thinking about programming, but typically for these mods I hear its not worth it, would you agree?
Pat

 

Yes, by the way, the two on the left IS the best cat back out there
Pat

 

20tl sounds like a good catback, but it just wouldn't look right on my t/a what can i do

 

The loudmouth looks really good on T/As.

 

yeah, but sounds atrocious in my opinion