if its pre -6 just do the 5/16" copper spacer if 2006 or above i would say
mrev2

 

What he needs is the 5/16" Spacer and the MREV2 available from
MOTORDYNE @ www.motordyneengineering.com or call Tony @ 661-993-5111. They'll answer all your questions without telling you to do a search!

 

really help me out, cause some kid told me all i needed was a 5/16" mododyne copper spacer for my 03.5 instead of the mrev2

whats u take on this

 

He's correct but it's not a copper spacer. It's a 5/16" spacer with a copper
gasket and a valve that shuts off the hot water to your plem in the summer
so you don't have heatsoak conditions that rob your H.P. Give MotorDyne
a call.........they'll explain all your questions!

 

MREV is the best out right now IMO, but if you wait a couple of months cosworth is coming out with a plenum that replaces both upper and bottom. and are claiming it will yield more gains than MREV... with motordynes plenum you will lose 2.5 hp @ 62hun rpm. I will prob be the first to have the cosworth and will post my dyno when i get a tune @ technosquare.