From the PDQ(parent of DiabloSport) web site, they claim 30 HP for the chip alone. When they added a pulley(didn't' say what size) and an exhaust,(again unknown type) they made 497 RWHP! That about 585 HP at the crank. They have the dyno sheet, check it out @
http://www.pdqperformance.com/pdqstore/news.phtml?nk=14
http://www.pdqperformance.com/pdqstore/news.phtml?nk=14