I want to get a plenum spacer but first I need to find out which type is better. Angled Plenum Spacer or a uniform thickness plenum spacer?? Thanks

 

Talk to Tony @ Motordyne (Hydrazine on the forums). . . he'll answer any question you have on spacers. . .

 

iirc...you want to keep the angle of the oem plenum in order to keep the velocity right. so you'd want the flat spacer to maintain that.

i could be totatlly wrong tho...tony did the research on that

 

Nissan Sport Magazine (formerly Sport Z Magazine) did a comparative test a while back on several different plenum modifications and came up with these results.
http://www.motordyneengineering.com/dynos.htm

It was the smallest of the spacers gave the best "overall" performance.

 

So which would you get for an 04?

 

I generally recommend the 5/16".

 

I am also interested in the differences between the angled plenum spacer from Z1 and the flat one from Motordyne. Is there a big difference between the 2?