Stock muffler

[motorworx]

Is there a difference in stock mufflers?

 

[Petty Race Engines]

Yes, the hemi and non hemis are different, OTB rules should prevent you from swapping them

 

[kamml53]

What is the difference?

 

[Petty Race Engines]

Appearance wise the square box is a hemi and the multi angle is non-hemi, performance wise, I can’t say if there is any difference, both restrict the flow

 

[DynoDon]

There is a performance different

 

[Petty Race Engines]

There is a performance different

Don, I’m assuming that the non hemi performs better ?? I’ve tossed a few hemis with the multi angle muffler but never a non hemi with the square

 

[DynoDon]

Yes. The non hemi breathes better because there is only one screen with square holes. The hemi has 3 screens

 

[bullerman]

Thanks for the info. I didn't know that about the mufflers. If we run a Box Stock class next year I will watch.