The engine is a Picco Maxx 21 and the pipe is from RD Logics.

Some of the modifications include:

removing the radio compartment
relocating the throttle servo to accomodate a slide carburetor
Kyosho gold shocks (soon to be replaced with associated units)
relocated steering servo
OFNA big block engine mount for the HPI Super Nitro RS4 (some chassis modifications were required)
Kyosho Super10 100cc fuel tank in the rear
Stock 75 cc tank relocated to left side of car for weight distribution (soon to disappear as it's not needed)