Just dyno'd this past weekend. 275awhp/245awtq. A 2007 STI Cobb Stage 1 went on the dyno after me and put down 245hp/255tq. Cobb rates that map at 325hp/340tq flywheel. Cobb rates my cars map (vf34 map) at 320hp/295tq. As you would imagine, I'm very happy with my results and feel like I did a good job with the mods. Even better - many of my mods were used and saved a ton of cash. Tein SS-P C/O's $800, Bosal Divorced DP + gutted 3rd cat + Cobb 3" CBE $150, Volk TE37 16x7.5 (12.1lbs) + Potenza RE-01R $1500, K&N Typhoon Crinkle Red SRI $100, 2006 6-speed swap $3200(+labor), 2006 STI TMIC $200. One of the very nice things about the WRX is the aftermarket is so huge, and there are so many people modding that used parts are pretty regularly available.
I wanted the car to have usable power. Enough to have fun and not find myself way above the speed limit. I didn't build my WRX to be balls to the wall fast. A PE1825 would have served that role, but I didn't want to risk blowing the engine, nor did I want to break the trans. The reputation of Glassbox is not entirely undeserved. My trans felt fine until I upgraded the clutch and started launching a little bit, and started shifting more aggressively. Lesson learned, I ended up breaking the 5sp anyway. At this point, I'm planning on getting a protune, I should be able to hit 290-300awhp/260-270awtq.
The car gets into boost very early. The TGV deletion and being catless help quite a bit. I'm building boost by 2k, full boost(18psi) by 3k. I can cruise in 4th gear at 25mph around 2000rpm. Once above 3k the car pulls pretty hard at a moments notice. My mod list is pretty long, pretty much everything I could find to make it breathe easier, then some braking, suspension, and drivetrain mods. I surprise alot of STI/EVO/MS3/M3/GTI/GT/etc. People misjudge the car, and I love having a sleeper. I've been getting 23-24mpg, but now that winter gas is here I'm getting 21-22mpg - however, with the cold weather I've been romping on it a little more. So it might not even be the winter fuels fault.