Yeah. John (the owner) wasn't too impressed with the dyno either. We were being very conservitive with our expectations, and we were still disappointed. He is currently using HP Tuners and some new gauges (wideband O2, aeroforce gauges to monitor all different engine parameters, etc...), so he is going to start pecking at the tune to see where some of the missing HP went. With the wideband, he was able to prove FLP screwed up the tune. They measured the AF ratio after the catylitic converters (which is a big No No in tuning), so it was inaccurate. FLP tuned it to run around 12:1, according to the O2 reading after the cats. But after John installed his new wideband pre-cat (only a couple weeks after the tune), we saw that the AF was actually holding steady at about 10.5:1, not 12:1 like FLP had thought. So, we know there is 10-20 more HP right there alone. Glad to hear you had good luck with yours. 430 hp is quite impressive! Is yours a manual trans? If it's an auto, it is even more impressive!!

I have a 04 GTO with the same supercharger setup.. i have shorty headers, stock mid pipe.. and I make 430hp/438tq.....

He had a good amount of belt slip and we are also questioning FLP's tune. Also, it is an automatic. Once some of the little issues get ironed out, he is looking to get about another 20-25 hp. Still, very impressive numbers from your bolt on LS2.

Damn, my bolt-on 06' makes 405 rwhp and 407 tq.