Originally Posted by Clap135
+1 Shivs tuned and bolted n55 doesnt even hold 300 whp at redline, hell he barely does it at 6.5k in a all out effort
On the dyno we used, our 135 stock baselined approx 10whp lower than the OP's. So comparing nominal numbers taken from different dynos is probably a bad idea.
But if we must compare, you can peek at this: http://www.e90post.com/forums/showthread.php?t=505867
Even running the stock tune (with downpipe, cat-back and chargepipe), the car put down over 300whp at 6500rpm. No top end roll off at all. That's from the downpipe.