I was reading on midwestmini.com about the fmf pipe for the lt 80 and they say "This pipe features a true expansion chamber design for an excellent midrange and top end power increase. Easily bolts right on without jetting changes"

How can u add a pipe with no jetting changes at all are lt80s jetted rich to start with?

 

I have an LT with a FmF and I actually jetted DOWN. They are jetted extremely rich from the factory. The FmF are good for a stock motor.That's what they were designed for. It may run a Little better but not a whole lot. If you want to stay stock and have a shinny pipe then it's a great pipe in my opinion!

 

Wow hard to believe a pipe would net lil to no gains but i guess if ya dont have to rejet that explains it if it made more power ud have to rejet.

 

We also have the FMF pipe on my sons LT80, I jetted it down too. It runs without rejetting, but runs better if you do.

 

Thanks for the info!