HercDoc,

For mufflers, for both engines, the [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXJB16&P=ML]Tower Hobbies Muffler[/link] is the best option - imho. Cheap in price and the power boost is significant. It's all I'll run on my TT Pro 46 engines. Unfortunately, I see Tower is out of them until possibly mid September. It'd be worth the wait, however as they really add rpms to the top end.

For Thunder Tiger Parts [link=http://www.paulsmodelsupply.com/]Paul's Model Supply[/link] can't be beat. Great service! Paul knows his stuff about engines. He usually has a very good stock of TT parts - as well as parts for many other engines. And he has the best prices on TT parts I've found. Call him! He's really easy to talk with on the phone. He ships quickly.