what does he mean "higher average"?

im still trying to debate whats better for a 5at?!?!? but then again i dont want to lose the stock engine cover so the only way to go is a 5/16

 

if you want the engine cover then stick with the 5/16". as with the 1/2", you'll gain a few more hp over the 5/16" but only at high revs. with the 5/16" you will make less peak hp but will have more power at midrange than than the 1/2".

 

See the dyno section of our website. The analysis shows everything.

 

i had the 1/2" installed and got to keep the stock engine cover on.

 

I am curious...

I keep hearing that the 1/2" spacer will dramatically change the sound of the motor but have heard nothing about the 5/16 one doing so.

Can anyone give me some insight to this?

 

i havent noticed that big of a difference in sound. i had the z-tube and the k&n filter installed at the same time as the 1/2" and mrev2 and i think most of my sound comes from the z-tube during wot. there might be a little contribution in sound from the 1/2"...

 

Its not dramatic, but it does change the sound.
A little deeper and louder.

 

I had Stillen CAI and exhaust for quite a while prior to installing 1/2" spacer... The spacer definitely made the motor more throaty - gave it a grunt... matched the oomph nicely!

So to answer a couple of posts up... yes the spacer changes the engine sound and for me it wasn’t mistaken for the intake (that sound was already there).

Cover will fit with 1/2" spacer - but why have it?

 

good to see your gain!

 

good thread. Motordyne 5/16 copper iso thermal is on my "to-buy" list

 

Figure I would bring this thread back...
I recently purchased the basic 5/16 spacer, didn't really feel any bump and I was wondering if adding the iso thermal would help in maybe feeling more of a bump??

 

How it is felt is purely subjective but either way your engine is making more power with it.

 

Cant wait to get the plenum spacer, such a good mod!
Is there a big difference between the size of the spacers? I have heard the 1/2 MD spacers dnt offer much more(if any at all) gains over their 5/16 spacer.

 

Just out of curiosity, does the plenum spacer affect smog inspection?

 

If its seen it will.