you know how the exhuast of our nitro cars are let out on the sides of the cars. i was wondering if there was a way to make it leave out the back like an actual car? could i like put a rubber tube and use that as an exhaust pipe? or would the tube melt? i was just wondering... to add a lvl of cool to my car hah

high temp silicon tubing will work, but it will probably cost you some power.

look for the exhaust that goes on the traxxas nitro stampede, the manifold only works with a side exhaust engine, any of these "could" work, look on your car to see if one of these could fit.

http://www2.towerhobbies.com/cgi-bin...?&I=LXJF71&P=7 (loud)
http://www2.towerhobbies.com/cgi-bin...?&I=LX3469&P=0 (quiet)
http://www2.towerhobbies.com/cgi-bin...?&I=LXD486&P=0
http://www2.towerhobbies.com/cgi-bin...?&I=LXN374&P=0 (quieter)
http://www2.towerhobbies.com/cgi-bin...?&I=LXU708&P=0
http://www2.towerhobbies.com/cgi-bin...?&I=LXU710&P=0 (use with first one and silicon tubing)
http://www2.towerhobbies.com/cgi-bin...?&I=LXARR0&P=0 (meant for a plane but worked good on my stampede)

all these will fit on a .11, .12, .15

People make dual rear exhausts for rs4's but I have heard they fdont work and rob your car of horsepower.
Nitroracer

I have tired to make a rear exhaust for one of my cars before, but it didnt work and totally mucked up the engine so i had to take it off and the engine worked fine again.

http://www.rcuniverse.com/market/item.cfm?itemId=66616

like james and I said they dont work!!

The link you gave looks almost identical to the one i made (except he painted it blue), its only pieces of copper plumbing pipe (painted) and they dont work!!!!!