Thanks for all the info on this. Though the 20 does appear to be a bit smaller (especially when using the alternate muffler), the difference isn't all that extreme. This basically boils down to whether I want to spend money on the 20 or just use the SPE that I already own. For now I think I'm going to go with the SPE. If it turns out to be too much I can always change out to something else later.

Thanks again.