I knew for sure this crappy setup was holding me back normally aspirated and I could only imagine the backpressure it was creating for the turbo.  Turbos do not like backpressure and they do not get along at all with chambered style mufflers like flowmasters.

 
The hot setup these days is the Dynomax Ultra Flow aka the Ultra Flow "welded".  These things flow a ton and they are also very quiet.  Unfortunately it is a pain in the ass to get the wlk-17394 cat back at a decent price because when you order it from Summit you have to pay a $60-75 truck freight charge, not to mention it is always on back order.  So this is what I did.  I ordered the two Dynomax Ultra Flow mufflers (Part number: wlk-17222) at about $60 each.  Then I ordered the Summit 2.5" catback (PN: SUM-680793).  This catback comes with 2 summitt super turbo mufflers and a set of 2.5" mandrel bent tailpipes and it is only $180.  So I got two extra mufflers and still came out at least $80 cheaper, then I was able to sell the super turbo mufflers for $40.

Update: 4-17-04, a reader notified me that www.fulllineexhaust.com offers dynomax products with FREE shipping.  They are not in any way tied to this site but if you order from them please mention you saw it here.  Check here for more info.

I took the car Keith at Street Flight who dyno'd the car several times with the flowmasters at 10 psi of boost.  Then he cut off the old cat back and welded on the new mufflers and tailpipes.  Afterwards we re-dyno'd the car without touching anything else.  The results you see below show the best of the Flowmaster dyno runs and two dyno runs with the Dynomax Ultraflows made back to back.  As the power curve shows not only did I pick up horsepower and torque throughout the RPM band I also picked up better spool time.  Look how much faster the power comes on now.  This was with the car making 10 psi up to about 4000rpm then the boost was falling off to 5 psi because of some intercooler piping and wastegate problems (I have since fixed this problem for the most part). 

The car is also very, very quiet, to see a video demonstrating this, save this video to your hard drive by right clicking and choosing "save as"  Video.  The car sounded damn near the same when I had the flowmasters on too, the turbo really quiets everything down.  If you want your car to be louder but still have high flowing mufflers you can try the Dynomax Bullets.