Anyone just running one or the other? I have been road test the two together and seperately and I would like to hear from the members to see if your results match mine.

On the Rev-up the two go together

when mrev first came out, it was only for rev up engines. it used to be that mrev=lower plenum + spacer
and
mrev plus= polished lower plenum + spacer.

now that mrev2 is marketed to non-revup engines, mrev=polished lower plenum.

SO, for a revup engine, the spacer alone doesn't work, but when you combine the spacer with the plenum, you get decent results.