RE: OS .46 LA or .46AX
Couple tips w/ the .46 LA. For more power, take the muffler apart and remove the baffle and reassemble with loctite on the bolt. You will need the power for the extra weight of a SPAD. Also, the screws on the plastic backplate tend to loosen up. I would remove and reinstall w/ loctite. Be careful when you are cranking them down, because you can crush the plastic.
-Scott