I did that for a guy a few years ago under an AU sedan with a modified set of pacemakers and a pair of 5L XR8 cats

It's a squeeze to get the cats in and I joined it into a single 3 inch system using an AU V8 single 3" rear section.

What you want to do will fit and it will work. PM me if you want to run the engine info through Pipemex and and Engine Analyzer to work out the pipe specs, X-pipe placement ect.

That's good to know that it will fit.
I want to do IRS under the rear as well, so that will help with rear routing a little.

Typing you a PM now.

Here's the thread I found where the guy made his own 6>3>1 headers for a BMW I6.
http://speedtalk.com/forum/viewtopic.php?f=15&t=22932

here's some twin pipe on an NA six.
Not sure if this will work for others as it off a forum that is passworded.



OR some single pipe action

^^ They look hot. what kind of times are those NA 6's running?

That stuff wasn't posted. It was an old thread so I don't want to mine it just for that.

probably in the 8's

Well I got the Pacemaker 4495's, 100cell venom cat, and XFORCE twin 2.5" catback fitted up this afternoon. Shop had some issues with the catback not fitting right, as it was a very tight fit. They dislike XFORCE as it's a problem they've been having with each system they come across.

Either way, I can't tell the power difference because it's raining and anything more than a 1/4 on the go fast pedal = wheel spin.

Best thing is the note. Before with the redback extractors and catback, it was loud. Not gonna lie, I liked it, but it was far too loud. This system is quieter by far, yet sounds amazing. It rumbles away to the point where you nearly can't hear it, then when you give it a quick stab it comes to life.

Overall, quite happy with the result. Now to see how much power the car puts down on Saturday, ready for the gearbox and diff + tune.

I just had mine dynod on the weekend with my new Varex muffler

Valve Open was 199rwkw and closed was 138rwkw, when its closed its get redirected through the sides of muffler through a 2" whole.

anyone running a 2" system is good for 138rwkw haha

from my experience with anything exhaust in later model cars........... you'll find you cant tell any difference in power. But then a couple weeks goes by and it magically seems to go a little better

ecu learning possibly?