The TF in-cowl muffler should perform fine, but may be a little louder than the stock 2-stroke canister muffler. If you opt for the in-cowl setup, you might take some time to port-match the header to the exhaust outlet of the engine. I have a Super Tigre .75 and the TF header for same, and the header did not match the outlet for the engine exhaust port. I spent some time with the Dremel and a carbide bit to match the opening to prevent excessive exhaust obstruction (better performance).

Pilgrim