Anti reversion muffler

[Matt49]

So after reading on Crate Insider it appears these are targeted towards classes that do not allow tri-y's? we dont have crate lates around here so i have never paid attention to the rules, is that the case?

Crate Insider is geared toward crates and mostly toward crate late models. The three major crate late model sanctioning bodies (Fastrak, Nesmith, and UMP) all prohibit the use of Tri-Y headers. Most other regional and local sanctions/tracks derive their rules from one of these 3 and I don't know of any that allow Tri-Y headers.

[DirtRacer317]

What would be better on a 1/4 mile or so track The 3" Inlet 3" Outlet or the 3" - 3 1/2" Thanks for any input.

[powerslide]

Thanks Matt, thats what i gathered from reading crate insider

[CrateInsider]

Thanks for all the mentions about our site. Yes, we gear all of our tech info directly to Crates (regardless of the applicability to other classes). On the Tri-y's, they are allowed in some modified classes, but not allowed in most late model classes.

[steelkiwi75]

hey steve h.

I have a set of shoenfeld headers with the extensions they suggest.would I just add to those extensions or cut them off. Thanks dennis

[RW57]

Schoenfield now makes a anti reversion muffler also.Just came out 49.95 each 3 in inlet 3.5 outlet.

[derricklong38]

Schoenfelds said if you are running the mufflers ditch the extensions

[collateralDamage]

schoenfeld is correct if you are building a dyno queen. otherwise, you'll want some extension with their mufflers.

[PushinTheLimit]

So do these mufflers make the exhaust sound less loud at all?

[RW57]

It made our engine sound totally different I would say it is not as loud as the dirt pros we had on also a lot less wgt than the dirt pros.

[mudcrasy]

Just wondering if these have been tested with stock cast manifolds? Been reading about them and cant find anything for cast manifolds. Also would they work the same with 2 1/2 exhaust pipe ?
I also have a 11.5 to 1 motor would these help or not much gained ?
John