As the title said, I haven't seen anyone do it yet. I know that the Mrev2 is what makes the most power on the revup motor so my question is, could I use just the Mrev2 plenum with out the spacer? Any negative effects, or would it be fine without it? TIA

 

Yes, it's been tried, and it sucks. on the revup you need the spacer

 

Hmm alright, why does it suck so bad with only the Mrev?

 

Probably because of the small changes over the non-rev up while keeping the upper plennum the same

Since the MREV2 is an old lower plenum thats been modded its not as effective without the spacer due to the cam phasing and larger lobes of the REVup

That would be my best guess ---- I will be using the MREV2/Spacer combo as soon as I can --- gains look great with no ill effects

 

Why? If you are going to go through the trouble of removing the plenum, put the spacer in while you have the top half off.