Silencing exhaust sounds a bit, study to find out what is possible without adding much weight.

Over the years I have tried several options, First one was the exhaust tips used on a VW engine exhaust on each end of my 1/2Vw engine. Worked great except they clog up and HP goes to slightly north of zero. This test shows using two can mufflers, from Tractor and aircraft supply, reduces sound by about 6 dBa which is about 50% reduction, with a total weight add of approximately 3 pounds, by the time exhaust pipe stabilizers are added.

Tires on Black Max wheels

The 2 ply rated 4:00 x 6 tires that come with the Black Max wheels are very light but tires are not made very good. The wires will come out of beed if to much pressure in tire and or if they get bounced hard on landing. Almost impossible to use tubeless. I use self sealing tubes, small stickers will penetrate tires. The 4 ply tires are a bit better but on hard surfaces do not last long before wearing thin