With my conversion more than 2 years old, the only remaining "issue" has been to find/make an exhaust system that suits my need for a relatively quiet system that still makes decent power. After a long search and now four exhaust systems, Dave Ellison of Triad-west Performance came to the rescue. I sent Dave my stock cat from which he built a jig to make a complete exhaust system for 993 heat exchangers. He can now make them for Bischoff (oval), or Gillett (round) flanges. I had the system ceramic coated and installed it last night.
Dave's work is exceptional and his attention to detail, patience (with me) and follow-through were all greatly appreciated. The system consists of a "turbo-pipe" (he'll have to explain) which feeds two glass packs. I had 3" tips installed to properly fill out the valence openings. The sound is quiet (but a bit louder than stock) with a subtle, low pitch rumble that really sounds great. There is no drone at all. It's exactly what I wanted.
Performance is very good for a streetable system. I have a track only setup that is straight through, but it's way too loud for the street (for me).
The really good news is that the Triad system now fits with the stock 3.6 heat pipe in place. Countless measurements and phone calls between me and Dave resulted in a bolt-on system that requires no modifications to install. He installed two O2 bungs, in my case, one for the DME and one for my Halmeter.
Here are some pictures of the system:
This next one shows the space between the heat pipe and the exhaust system:
This one probably rings out a few more ponies and will see action on track days only:
For every day use, Dave's solution fits the bill perfectly. I think he can control volume by using different types of mufflers, but you'd do better talking to him about options. Here's a URL
http://www.triadwestperformance.com/Products.htm. Dave did not solicit this plug, nor do I have any stake in it. Just a very happy customer who knows the hassles involved in finding the right combination of performance, looks, and sound in a 3.6 conversion exhaust system. A happy customer at last!
A couple more:
I have not dyno'd this system and I don't think Dave has either, but it would be interesting to do some comparisons. Since this is going to be a street setup, I'm not going to bother.