Basically I'm new to R/C cars and I've just been given a Nitro RS4 MT, the engine isn't as good as it should be so I was wondering if there was an engine upgrade you can do? And if I can, does anybody know where I can find one? Cheers

direct drop in

http://www.ebay.com/itm/HPI-Nitro-En...ht_1167wt_1136

Not a direct drop in, the RS4 MT uses a threaded shaft enging instead of a SG shaft.

This is direct drop in: http://www3.towerhobbies.com/cgi-bin...?&I=LXGGP7&P=0

Or a little more OOOOOMPH: http://www3.towerhobbies.com/cgi-bin...?&I=LXHLV9&P=0 Youd need to buy a new header for this one tho.