http://www.zzperformance.com/grand_prix/products1.php?id=931&catid=109
99+ Chevy/GMC 5.3L truck turbo kit
Available Intercooled or Non-Intercooled
results on a 99 GMC 5.3L
stock dyno 204whp
Non-IC at 6psi 270whp
Non-IC with open downpipe at 7psi 305whp
Intercooled at 9psi 334whp through the stock exhaust
Intercooled with open downpipe at 11psi 400whp!