Header size?

[MKW]

I've got to build a header for my Predator that is going on a Murray. The Predator only has a free-flow air filter kit and a 36 jet / 140 emulsion tube. So, what size pipe should I use to get this thing to run the best. I will be using a RLV mini 91 muffler.

Thanks,
Mike

 

[Bama Jama]

Mine is 1" and does fine.

 

[Newoldstock]

Best pipe?

Stock engine look for something like this.
Best bang for your buck.

1" Go Kart Exhaust Screw On Muffler