Re: 502 MPI Help
 

I think you might well get 2mph. I put on EMI Thunders and modified my intake suppressor on my '99 454 Mag MPI and gained 1-1/2 mph for the exhaust and 1/2mph for the intake, then lost 1/2mph to a drive shower. Those cast iron Merc manifolds are boat anchors! I also installed an adjustable fuel pressure regulator but the fastest boat speed ended up being at the factory pressure setting! :cool:

Re: 502 MPI Help
 

:bunny: up date, on buds 35. adding msd box, 1.8 raito roller rockers, dicthing the the stamped steel ones. this is whalt thier telling him k&n air 8 to 12 hp--roller rockers 25 to 40 hp--haedders 40hp--brainbox,40hp set 5500rpm, fuel pressure set 39lbs. 87oct to 91 oct fuel. going to take it swimming this weakend. will send up date. :drink: :D

Re: 502 MPI Help
 

WOW 113-132 HP gain :eek: :rolleyes: I am sure that it is going to help but I would bet that the biggest increase is going to be seen in raising the rev limit. Keep us posted. :drink: