huskydave
Addicted to ArboristSite
I recently bought a 372xp and I want to mod the muffler at some point in the future. Which is better the open hole in line with the exhaust port or the two pipes coming out of each upper corner. I also have not read any dimmensions for the large hole type some look bigger than others, some are round and some oval. Which works best same goes for the two pipe method some use 3/8" tubing some use 1/2" which will have better results 80% of the port is also a little confusing how big is the port should I measure that with my vernier? I am a machinist and like to do things right the first time this is the reason for my post. I was also wondering if the ignition timing can be advanced from 0-13500 ie move pickups? or is the timing fixed I know it has a rev limiter.