Im running a 17t spur and the 54t RRP(and yes, its the only steal one I know of for the MGT). It really seems to be coming alive now as Im just starting to get the tune real good. I also took out one of the cooper shims anbd that made a BIG difference. I had what I thought was a little trouble getting the lsn to hold but as Im getting closer to a good tune it seems to be oK......this is only my 2nd nitro so Im no pro at this