I do all my own work, but those are good shops you've listed. My ducting thus far has just been hoses ran from the bumper to the calipers. No collectors at the bumpers and no nozzle at the brakes, and they have worked well. But I'm rebuilding them just for the fun of it with the collectors and nozzles. You'd be fine with any of the kits out there: AMS, Forge, or Hot Lap.

If you ever want to check out the lowered seats and talk track in general let me know.

Now it's time to go into the garage and rip my motor out FTW!

 

I don't have ducting - probably why I had some modest fade with the DS2500s!

I've had good experiences with West Werks in Redmond. They aren't Evo focused but very capable, they build and sponsor PRO3 BMW E30 race cars, among other things. I'd trust them with everything but tuning.

I've done my lapping at Pacific Raceways and Bremerton over the past 10 yrs. The BMW club runs excellent HPDEs though you have to join the club, and if an HPDE gets full, they'll take BMWs over non-BMWs. But that membership will also allow you to run with the Porshce club. My favorite is the Alfa club, you don't have to be a member, and all sorts of cars show up, including an Enzo a few years ago. There is also the Audi club but I'm not sure how they operate. All the clubs kind of share a common pool of instructors so you'll get a lot of perspectives.

 

playing Forza 2 improved my autocrossing a lot. you can race your ghosts and see what lines works better for your car around turns.