I have read all the old posts but I am a little confused on the summary as people are giving different answers

obviously mrev2 + 5/16" spacer is the best combo, but I will not be able afford the mrev2 for probably a long time.

so currently I have the 5/16" motordyne spacer and I have heard that swapping out the rev up lower plenum to the non rev up lower plenum creates an mrev1.

which would be the better combination for my rev up engine the non rev up lower plenum + 5/16 spacer or the rev up lower plenum + the 5/16 spacer?

Thank for your help!

 

The MREV2 is supposedly a modified non REVUP lower plenum.

A spacer alone on the REVUP engine is proven NOT to produce ANY significant gains.

The best you can do is find a non REVUP lower plenum so that you can have some added benefit of the spacer.

 

what year is your car and is it a 6mt or auto matic?