I was seconds away from pulling the trigger tonight on the Motordyne 5/16" Iso Thermal Plenum Spacer.... However, I noticed that they are on backorder until mid January!

I can't wait that long. I know, it's not that long, considering the HKS exhaust waiting list, but I gota have my plenum spacer NOW! Does anyone know where else you can order them other than directly from Motordyne?

Lastly, I understand that the 1/2" spacer will not accomidate the engine cover, so, with that said, is the extra $50.00 bucks worth the little extra horsepower over the 5/16" spacer?

I have an 04 6MT! Looking for my best option for horsepower. I want the best gain, so even a full Crawford plenum isn't a bad second option. Actually, according to the Dyno's on Motordyne's website, the spacers put up better HP gains! I wouldn't have guessed that! So, if there are no alternate sites that sell the spacer, should I just get the full Crawford Plenum?

Considering the slight price difference, should I just get the full Plenum?

Wait for it bro. Get the M.D. ....Wait... .

if you end up getting a plenum...i have a crawford cast plenum for salealot cheaper then retail and used for 3k miles...pm me

I think performance nissan sells the 1/2"? Not sure, but I know they sell the MREV. I will probably be getting the 5/16" because I want to keep my engine cover and from the dyno's I have seen, the 5/16" get a little more power down low where I like it, but not as much up top as the 1/2"(about 1hp more past 5k). But, thats what my SC is for.

I'd wait for the spacer. Your engine cover will fit right over it and no one will know the difference.

Im going to wait till the 5/16" Iso Thermal spacers are available. I am also going to give the Motordyne a call tomorrow. See what they tell me. Regardless, Thanks all for the advice.

crawfords plenum is t3h ugly ._.