With the car completely apart Ryan and company acquired the 2.5L USDM STi with semi-closed deck case and proceeded with the motor buildup. A millimeter or so of the block was machined out and then the Darton ductile iron sleeves were pounded in. As opposed to wet sleeves, these dry sleeves are permanent and keep the CP Forged Pistons from cracking through. The pistons are pushed and pulled by Pauter 4340 Chrome-Moly forged rods. These ultra-strong rods are known for their applications in sprint cars. After the head was ported and polished, it was off to Street Concepts in Aurora, CO, for the exhaust, turbo and intake fabrication. GT Spec headers lead to the up-pipe before expelling the nasty gasses through APS 3.5 turbo-back exhaust.
Other trick engine components include the pricey Autronic stand-alone engine management system and the Innovate wideband O2 sensor. The former replaces the Mass Air Flow Sensor and controls fuel and timing while the latter replaces the narrow band by reading intake air temp - otherwise known as speed density tuning.
Obviously, with the motor pushing 430 hp to the wheels at 26 pounds of boost, a stock transmission wouldn't fit the bill. A JDM STi six-speed transmission ordered through Vivid Racing along with a R-180 STi rear differential helps lay power to the ground by handling 75 percent more torque than the R-160, which has the option to adjust torque from 50/50 rear/front to 70/30 rear/front while the R-180 is fixed. Of course, the power eventually hooks up through Pirelli 215/40ZR18 P Zero Nero tires that wrap a set of 18x7.5 Volk GT rims.
While installing all these trick parts, Subaru actually had a recall on the driveshafts. Ryan and company found out the hard way, on the track. They busted the driveshaft on the first run. Thus they had Front Range Driveline build a custom unit using the stock U-Joints with a 3-inch diameter pipe and 11/44-inch wall thickness. With custom axles from The Driveshaft Shop, this bad Boxer-powered Subaru is built to lay the power down to the ground, not into snapping parts.
After this, Ryan and his dad are planning on going full-race with a six-point rollcage, gutted interior and water or nitrous injection. Whatever speeds obtained by this father-son duo in the future remain to be seen but one thing's for sure, there's no limit to what can be done when a father and son team up.