I have a 24" long by 4" diameter aluminum glass-pack with thin wall 2.25" OD curved pipe on one end.
Other end needs a pipe of your choice welded on. The end caps look like die formed thin wall stainless and are removable for repacking of the body.
Included is a mount made out of curved aluminum with an ear. This can be attached anywhere on the muffler with 2 hose clamps.
I used this for 2 events on my solo formula car.
This type of muffler works better on a 4-stroke, but still did take a lot of high frequency noise out of the big 2-stroke.
Weight is 6.4 lbs with the curved pipe on it. Muffler itself is about 5.2 lbs
This muffler in a slightly shorter length is commonly fitted on P2 1005cc Motorcycle powered cars and supposedly meets the sound limit at Mazda raceway.
Originally Paid about $260 without curved pipe section from Burns Stainless.
Sell for $50.