That's my exhaust configuration - built and designed by M&M Exhaust in Germany who are the preeminent tuners for the Porsche Super Cup, Carrera Cup Deutschland, ADAC GT Masters, ALMS / LMS, VLN / BF Goodrich, FIA GT and Rallye Meistershaft race series. They also produce the current Cup S, Cup R and RSR exhausts for Weissach.

That's WAY to big for street driving. That's killing your low rpm torque.

To the contrary, my low end and mid range torque increased significantly. Keep in mind, that I still have cats in place (HJS 200 cell) in order to maintain sufficient back pressure.

Interesting, that's contrary to everything I've ever read about exhaust tuning. I'm sure you know there's much more to pressure wave scavenging than just backpressure. Those are big-block V8 numbers.

+1
I'd like to see a clean stock 3.2 on a dyno, back to back with this car for comparison.

The vehicle was dynoed after the exhaust upgrade. And, along with the Evo intake and ECU tune, it developed approximately 23 lbs/feet of additional torque starting from the low end right up through the mid range. My vehicle has not been dynoed since the installation of a a lwup. Also, a correction on the muffler inlets and outlets. They're 2.8 and 3 inches respectively.

From Eric 523's 3.6 race car build thread, obviously cat free with straight pipes.

Originally Posted by BYprodriver
Wow very impressive hanging with the big boys! Nice strong finish!
What size primary pipe on the headers?

The primaries start at 1 7/8'' and step to 2''. A little large for the current motor but I have another one in the works A 3.8L that may end up closer to 4.0L...

Also, I don't worry much about low end torque because the car never gets below 5800rpm or so with the short gears.