Hop Up Kit, 420 Predator OHV & 13/15hp Clone, Stage 4 Our Price: $1,149.00 Header, RLV 3-Stage Pipe, Thick Flange, For Open & Modified GX200, 6.5 OHV, and 212 Predator Our Price: $44.99 Engine Kit, GX390/420, 440cc, +.200 Cast Crank, 90mm Cast Piston Our Price: $313.00 Hop Up Kit, 208cc DuroMax, Stage 4 Our Price: $518.00 Hop Up Kit, 212 Predator Hemi, Stage 1 Our Price: $55.81 Engine Kit, 218cc for Non-Hemi Predator Our Price: $256.00