Pretty sure both the Milltek and the EP are the same diameter all the way, that is the only factor as far as tuning and power i believe. I think that all of the other options are a tad smaller...and that can be a factor.
I had milltek on my audi and it was a great exhaust. I dont think you can go wrong with either milltek or ep, just going to be tone and such at that point.

 

I had a fabspeed gen1 or 2... It Droned horribly... I'm now in search of something QUIET. I'll probably go with a fabspeed Stage3, but would prefer the EP2 quiet. My buddy has the MILLTek on his GT3 and it sounds good... Hard to tell if it would be a better choice or not... What about AWE?

Mike

 

I used to have a EP2L. Now have a custom EP with 1/2 the backpressure of the EP2L.
I've heard a report of the Mite cracking. Get the EP. You will NOT regret it.

On a more important note - seriously consider the GT700 vs. the GT640 kit. I'm assuming you're talking about a GIAC based product? You need the Hitachi MAF.

 

I did decide to order the kit with the Milltek exhaust. I went with the Stage 4 kit instead of the GT640 for now. The parts should be in next week and maybe another week for installation. I beleive Evolution Motorsports uses the GIAC programming. Thanks for all the input.

 

Well, I picked up my car today after the Stage 4 upgrade. I went with the Milltek exhaust and I think it sounds great. The modifications were well worth it. It feels like a completely different car. Thanks for all the input.