Toda has put together a package for those of us running K24 motors of all varieties. Even those running K20 heads. The package includes two varieties of pistons raising the compression of the motor to either 13.1:1 or 13.2:1. Strengthen connecting rods have been included to ensure durability with the new found power. Two head gaskets were designed in order to properly mate DC5/EP3 and CL7/FD2/FN2 heads to the block.

[source: toda]

Forged piston are good first step in ensuring the life of your motor when increasing boost. Cast pistons without a doubt fall short of the task when introduced to these high pressure levels over extended periods of time.  Knowing this fact, Toda has released a forged piston kit for the Evolution X’s 4B11 motor. The kit comes in two variations, one for a compression ratio of 9.1:1 and the other for 9.2:1.

[source: toda]