Have you compared Evo Velocity Stacks to standard ones?

[scott2ride]

Have any of you done a dyno test that has compared these.
Im told the shorter "Evo" stacks make a little more top end Hp, but dont lose anything in midrange or low down.

Whats been your experiences? I imagine you'd lose midrange but could be wrong?

[Bill in OKC]

I have them, installed them and they look cool and are very high quality. I wonder about the 54mm stacks on my 51mm TBs but what the heck I'm just in it for kicks.

[rsv racing]

I'm inltalling mine next week with HiPo kit so I don't know from personal experience. Howeve, I've read that unless you have the 54 t/b's, you will loose midrange. But once again, I read this on the rsvr.net forum. Good luck.:)

[rustie6]

Naw, I had the Evo 54mm stacks on my 51 T/B's before being modded to 54's and felt absolutely no difference at all. You are talking about such an almost insignificant differential that it would barely be noticed on a dyno (A/B'ing stock to Evo stacks on a 51mm T/B). I just did it for the convenience since I knew I was eventually going to mod the T/B's anyway.

If I remember correctly, Ken did test that config and could not find any degradation either......:cool: :cool: :cool:

[micah apriliaforum com]

We have tested the true 51mm "sp" stacks, the evo stacks (54mm) and the stockers. The short stacks are good for about .5-1bhp on the very top in either 51 or 54mm without a loss anywhere else. Nothing huge here, but not too many $$$ for a small gain.