I called slimline the other day and that muffler for the EZ mustang is out now but it isn't a Pitts. It's for inverted mounting. I just find it hard to beleive that a) they don't make one for that engine and b) that one of the other Pitts doesn't fit that engine. Try Justengines; they have some (called BCM I think) that you drill and tap yourself. I just found that a few minutes ago. Thanks for the advice.