When i was younger, my dad bought 2 Duratrax nitro evader st s. I've started running them now, and figured out (brought them to the local hobby shop) that the piston and sleeve are bad in both engines. I guess this is because I have a sandy backyard where they were usually run. Duratrax (or whatever company made them) no longer makes piston and sleeve replacements. The cheapest motor the guy had in the hobby shop to replace the ones in my cars was like $110. I decided to find a cheaper replacement online. Would this be a suitable replacement: www [dot] nitrorcx [dot] com/nigasenfortr.html ? If so, do I have to replace the exhaust manifold and pipe? Or will they work with the new motor? Also, I'm selling the old engines for parts if anyone is interested.