Hey,
I have a 2003 G35 Coupe, and I was told that if I got the 5/16th Plenum Spacer that it would be useless without buying the MREV2 manifold. Is this true? Does anyone have a non rev up engine with just the spacer? Please give me as much info as possible. Thank you!

 

Whoever told you that had it backward. The 03/4 does not need the MREV2. The MREV is necessary for 05/6/7 coupes with the 6MT and the 05/6 sedans with a 6mt.

All 03/4 models don't need the MREV and all 05/6/7 coupes with auto don't need it and 05/6 sedans with auto don't need it.

 

Yep... what he said. I have a 3/8" spacer on my '04.... you don't need MREV.