Hey all, I've been searching trying to find the answer but with all of the threads about MREVS, still havent found it, atleast not for a Non - RevUp engine.

I currently have a Iso Thermal 5/16 Plenum Spacer. I am not sure whether I should install that OR should I purchase the MREV2 and install that. I would do both but I have no idea what I have to do in order to make it work. I heard a bunch of guys says something about a air fuel ratio but I really have no idea what that means.

Will there be greater gains installing the SPACER or the MREV2... FOR A 05 G35C 5AT, NON REV UP... ?

Also if you can DUMB IT DOWN FOR ME... What needs to be done to make both work together?

Thanx guys, and I definately searched but all results have been pointing to 6MT's and people saying they are going to do the setup and never posting results (if they ever did it)

I have both but haven't install them yet.

I'll soon to when I have time with the headers and custom headerback.

Look forward to my review / Dynos on G35Frenzy.com

I have non Rev-ups and put 5/16th MD spacers and iso thermal gaskets on both. I could tell a difference. I don't know much about the MREV because it's my understanding that it only really works for Rev-up motors, but I could be mistaken.

The MREV2 will work on rev up and non rev up engines.

You do not want to put the MREV2 plus a spacer on without the ability to tune as you will lean out too much.

That's my understanding anyway. I have just the 3/8" isothermal spacer on my 04.5 5AT.

As in reflashing ECU or what?

spacer should be enough.

You won't have a leaning out problem just by adding a lower plenum and a spacer. Your ECU will adjust.

So NO ONE would pick just having the MREV2 or having the spacer?

If you had to pick one over the other, I'd think you would get more benefit from the spacer, since it corrects the problem with less air getting to the two front cylinders. The MREV may smooth things out, or whatever it does, but it still won't correct that major flaw.

There is a huge thread describing the MREV in great detail either here or on my350z.com. Try and search for it, specifically for the user Hydrazine.

If you have a non rev-up, you can do either MREV2 or the spacer. Both give good gains across the board. The spacer will help airflow to the front two cylinders. I believe MREV2 optimizes airflow in the lower plenum and helps equalize length of the intake runners further.

If you do MREV2 and a spacer on a non-revup, it is recommended to have some kind of aftermarket engine management (e.g. reflash or something like a UTEC). Since i've already flashed through Technosquare, I'd slap MREV2 and the 5/16 on. Dyno it. Then take the dyno to technosquare to tune. If you are starting from scratch:

1. Dyno
2. If you are too lean, I'd invest in a UTEC and get it tuned.

Thanx guys

According to Tony Colette @ Motordyne Engineering, a spacer/mrev2 combo will not make you run lean unless you're already running lean to start. Here are a copy of some emails we exchanged:

Thats a given fact. With no mods on the car the car runs rich up top. Now u add i/e/h to your car then of course its going to run lean from the start if u install the mrev2+ spacers.

Only way your car wont run lean is if u install ONLY mrev2/spacers period.

sorry but you're wrong. these kinds of mods do NOT lean out your engine. allowing your engine to breathe easier has nothing to do with the air/fuel mixture. people should stop talking about things they dont understand.

What does it mean to run LEAN anyway...