I'm pretty confused...
 

Ok, before you guys go off on me, let me say that I've searched, even googled, but I can't seem to find a clear cut answer to my questions. So here we go.

I have an 03' base MT6 z, and I'm planning on getting a motordyne 5/16plenum spacer. The MREV2 is what I'm not too clear on. I've read that it's only worth it if you have the revup engine, (which I know I don't) is this true?
Also what is the difference between the MREV and MREV2? Do you recommend me just getting the spacer then? Also, how lean will I be running with these mods and is there any way to solve that problem without getting an aftermarket ECU?

Thanks guys, I know it's a lot of questions but I'd really appreciate good responses!

The various mods from motordyne and what mods are best for what motors have been addresses a dozen times. I suggest that you contact motordyne, discuss your needs and budget, and place an order.

There were really like 50 threads about this a couple of weeks ago, and the answers to your questions were discussed several times.

non rev-up = spacer only
rev-up = spacer + MREV2

I've got an 04 non rev-up and got the MREV2 anyway... couldn't feel a difference at all.