240 rwhp and 289 rwtq on a stock 99+GT with only a Magnaflow catback? Actually, that sounds so good it's almost tough to believe! Most stock GTs pull around 220-225 rwhp and 260-265 rwtq. Check out my bone-stock dyno pulls in my sig.
I noticed one thing that seemed a little strange - your correction factor is 1.00. In other words, there was no correction factor - what you pulled was the same as your corrected SAE numbers. Unless the relative humidity, air temp, and altitude of the dyno shop location was almost exactly at the SAE standards, this can't be correct. It's possible that was the case, but I'm pretty sure your temp is below the SAE temp. Lower ambient air temp (lower than SAE standard) would get more hp from - uncorrected, that is.
So, is it possible the shop isn't set-up correctly, or that they forgot to factor in the correction factor? It's odd that it's 1.00.
Not meant to flame, it's just awfully high for a mostly stock car.
gone but not forgotten: 2001 GT (5-speed) w/lots of bolt-ons / Best ET to date: 13.69 @ 102.4
new car: 2008 Pontiac G8 GT