do i need to get a tune just for a muffler replacement?

I landed this very tired, very green two-stroke moped, at sixteen years of age. Being sixteen, I cut Booger's muffler off and ran an open pipe in an effort to make it sound more authoritative. That modification was neither intelligent nor fruitful, but it was educational.

As my years of wrenching piled up, I learned a few things about exhaust work, and I'd like to share one with you: Changing your muffler can yield a lot of smiles in exchange for a reasonable amount of your hard-earned dollars. Also called a slip-on exhaust, a muffler-only exhaust offers many of the advantages of a full system at a price that is easier to swallow.

No...you need a tune up because there are too many miles on the plugs and wires.

No, and it also wont make much difference to the engine, apart from the noise level.

no