sheograth

I'm looking a tuned pipe that would fit my 1/4 scale CAT5 Disruptor without sticking out of the body. The engine is laying down and the exhaust port is on the bottom, currently there is a normal can muffler on there. I want to see if I can milk a bit more performance out of this thing, seeing that it has a muffler a figure a pipe would be a simple way to do that. Anyone know of any pipes that would fit this thing? Basically it has to either say inside the chassis or not go higher than the top of the air filter - that would mean the body can fit. Obviously I don't care about race legality or anything, I just run it for fun.

If not a tuned pipe, any kind of exhaust I can bolt on that would do anything at all performance wise?

EDIT: here are the pics