Ok, yes, I know you're thinking SEARCH!!!

How, hold on. I know there's a possibility of running lean on nonrevup's (03 5AT sedan here) w/ the combo. However, I'm going to dyno to get my current numbers as well as find out if I'm running lean or not. If I'm not, would you suggest both in a combo? I've heard some people say ONLY to go w/ one or the other even if I'm not running lean, so I just want to get a general idea.. thanks!

 

There is almost a 0% chance the spacer would do that.

 

combo.

 

According to EverythingG35, if your running an automatic (nonRev up engine) you should only run the MREV2 unless you have a fuel management on your car. If you have a 6Speed manual (rev up engine) you can run both.

 

The MREV2 will afford total stealth. The dealer will never know that you have it on.

 

That's not to much of my worry - I'm outta warranty anyway.

I'm just trying to figure out that as long am I'm not running lean (which, from what I understand, means I wont w/ the combo even on non-revup...) if I should do combo or just one or the other...

 

If you have a rev up engine (6mt) you can run both.
If only nonrev-up, (5at) only one or the other.
The reason you can run both on the rev-up is, the ecu has better parameters/programmed fuel mapping to compensate for this and not go lean, though you're about maximum of what the ecu fuel mapping can compensate for with that combo.
With nonrev-up, you'd be well beyond the ecu's fuel mapping parameters to compensate for the large increase in air volume/velocity with that combo and you will run lean, even if you're not lean now without that combo.
My vote is the mrev2 only for your nonrev-up VQ.

 

I agree its a non revup motor so i would just run the 5/16 spacer that will add enough power (unless you want a ECU reflash by technosquare then you can run both).

If you dont want a new ECU or reflash you might need a airflow controler or piggy back system if you have a after market air intake with the spacer it may cause you to run lean, but get it dynoed first and see the results the base it off of that.

 

Nismo G, I see you got a CTS V race car as your avatar. Nice!

Anyway, ya, I got the Stillen intake and exhaust.

 

aite i might sound stupid...but i seriously dont know what running lean means ...i was goin to get a MD spacer, but i have a injen cai....so would that make my car run lean...have an 05 G35C AT???

 

"Running lean" in basic terms means to much air for the fuel mixture... running rich is the oppose, to much fuel for the air mixture. It's all calls the AFR, or Air/Fuel Ratio.

 

The spacer won't do anything for your car since you have a 05 5AT. Your best bet is to go with an Mrev you will have more gains with this setup than just the spacer. Actually some lost power with just the spacer for the 05-06 yr model.

 

Get the 5/16th (torque) or 1/2 in. (top end) spacer together with the isothermal gasket (cools the intake plenum). My car is back to stock now and I miss my setup the engine is quiet and I have no top end power. 70 going to 100 use to be a snap now it feels like the car is laboring just to accelerate to that speed.

 

I thought that the spacer was fine on the 05 AT (280hp/270tq), just not the rev up MT

 

Yes, that is correct. The MD spacers will work just fine on the non RevUp engines. The spacer alone will afford little, if anything, on the RevUp engines.