@SpookDog
The 3MB code exhausts up to 1996 I think it was are just hollow with a restrictor in the neck of the exhaust which dremel the 3 tac welds out and it pulls out, as for the gutting part, that’s on like 2003+ bikes as inside they have like this mess packing, take that out and they go really well and nice and loud I love loud bikes
All my mates got road legal mx bikes and 40bhp 125s they do 60 hours on a piston and I’ve still got 9k miles left to do but got to admit they love to wheelie as got all that power and light as a feather