The DL50 muffler is the lightest of its kind, available for $35 from Bob at DLUSA. The initial problems seen with weak seems on the original muffler appear to have been worked out, as I have been running this muffler on my G62 all summer. The DA50 muffler will be stronger, a little heavier, and a little more expensive. The pitts mufflers can be significantly heavier than the OEM side mount DL muffler. So beware of balance issues if you switch from one to the other. My most recent slimline weighed in at 11oz, and the DL, with mounting bolts, no gasket (as installed) weighs a bit less than 3oz. 1/2 pound is a big difference so keep that in mind.