A few weeks ago i put on a Amazon port eaton with 2.91 pulley I got off fleebay. Well I finally got my car dyno tuned yesterday at Pro-Dyno, SC and it made 485rwhp/458rwtq. Other mods are Magnaflow catback, BBK X pipe and K&N filter pack. Everything else is stock. The tuner said that the numbers were low for a ported eaton at least in comparing it to a Steggy IV. He said he has dynoed Steggys and they were doing over 500 but after we talked a little more he told that the car he was comparing mine to had the stock TB and maf like mine but had a 2.8 pulley with a 4lb lower. I thought my numbers were right they should be but he seemed to still think they were lower than they should be. I'm thinking about going with a 4lb lower and a aftermarket heat exchanger. What do you guys think?