I agree, and yes you can swap any engine for any car but wait. Some engines might be too long and some might be too short. But just get the engine and use your same mounts from the thunder tiger and your good yo go
Exceed Madfire .21 now has a Ofna .28 engine. Had it for 3 years and was my first 1/8 scale buggy. It went through a series of engine involving the picco .21 Cpx, rex r80 you .27, and the Ofna it currently has now. Bashed it a lot and the only damage it has within 3 years is a bent rear shock...