im trying to decide what plenum spacer to buy. I want to know what would people recomend as far as price hp/tq gains and compatability with stock parts. Also i noticed some are less money thatn others even when they all claim to make the same hp gains (about 10+rwhp). I wanna pull the trigger on one soon gimme your thoughts

 

I think most members have had the best experiences with Motordyne (me included). It's an easy install and there was a 1/2" one for sale in the classifieds section.

 

I purchased the angled spacer from Altered Atmosphere because they are located very close to me and great to work with.

I installed it myself with no trouble at all following their instructions. Without question it gave me very noticeable gains and also improved the sound (made it deeper) at high RPMs.

 

what comes with different sizes? and also what difference is there between angled and non angled spacers?

 

What year is your car?
Manual or Auto?

Tony

 

its an 04 6spd manual

 

MD (Motordyne) has proven reliability, performance, and the best customer service... you will find that by far the majority of VQs use MD products when modifying plenum - and for good reason.

 

OK, for your application, I recommend the 5/16" Iso Thermal plenum spacer.
You can do the 1/2" spacer if you don't care about keeping the engine cover.

If you live in an area where it gets really cold, do the Copper version.

Tony

 

still curious to know the difference between angled on and non angled

 

AAM told me the angled design is such that it flattens out the top of the plenum so that all the intake runners get the same amount of air. Supposedly the stock plenum, which is angled, allows less air to the front two runners.

Also, the angled spacer will allow you to keep an engine cover on if you decide to get a strut bar.

 

A while back Sport Z Magazine (now Nissan Sport Magazine) did a comparison of many different plenum mods.

These were the results of the shoot out.