i was wondering, would a 2/3 plenum spacer be better than a 5/16 one ? or which measurement is probably the best?

its an '03 g35 coupe. everything stock

 

5/16 Motordyne.

lock thread/

 

Specs of your car (year and transmission)?

 

doesnt matter the make, just get a MD 5/16th. if you're revup get a non-revup lower plenum or mrev2. if youre a non-revup model keep your lower the same or get the mrev2.

 

No, I would buy the whole spacer if I were you.

(translation: search!)

 

+1
Motordyne did more R&D than anyone.

 

which spacer.... hmmmmm.... that's a toughie - I don't think anyone has ever really asked that one before... and since there really isn't much info out here about it, I'm not sure how anyone could really make an informed decision.

I guess you'll just have to take your chances OP.

Good luck ~

 

get the MD spacer, but choose the size based on your future needs, 1/2 if you are going FI, 5/8 if NA. Like above, get MREV or pre Revup plenum if revup. I just took a non revup to a machine shop and paid 150$ for them to make me an MREV. I had an 03.5 that was wrecked, and kept the plenum for my 05.

There is a SICK amount of info on the subject. I'd search a bit before one of the many grumps gives you the "go search for yourself you lazy a$$"

 

i appreciate the honesty, thanks.

 

MD spacer FTW

 

^^ what he said... MD



if you happen to find a 2/3 spacer... do not buy that...
that is someone just trying to sell you a 1/2 spacer with a 1/6 gasket...

 

haha

I wished this topic was discussed before...

How is this the first time it has come up?

 

on behalf of OP

 

If you plan on going FI save your bucks and go with the skunk2 1/2". I had that on my boosted Z and put 40K + miles on it and loved every second. The only con was not being able to put the stock STB back on.