Hey, I got a Midwest Extra 300XS with a BME 50 on it too! The thing is ballistic when you pour on the power! I'm running a 21x8 MenZ and getting 7100rpm(Kieth said 7200-7400 is the optimum rpm after breakin). Mine doesn't shake bad at all any more.. I am still on the 3rd gallon. I want to give a 22x8 a shot too.

I am also looking into putting my smoker in it, and use the backpressure type instead of one with a pump. Think the BME 50's muffler is hotter than a Saito 150's on the header pipe?