If you look around enough on the internet, you can find some pretty crazy and awesome builds like the one we found today, which is brought to us by North American Subaru Impreza Owners Club (NASIOC) forum user SWRocket. The thread centers around the build of his twin turbocharged LS1 swapped ’04 Subaru Impreza WRX Wagon which uses a Tremec T-56 6-speed manual transmission, and a 3rd generation Toyota Supra rear differential.
Unfortunately, after running the car about 10,000 miles after being built for over 550 horsepower to the wheels, the car finally had succumb to a rod bearing failure. The owner originally had decided to part out the car and sell what he could. However, he realized he loved the car too much, and decided to fix it instead. Upon disassembling the engine, he discovered one of the cylinders was completely damaged.
That’s when the owner decided to consult a fellow forum member about a LS engine swap. After much discussion between the two, the owner decided to purchase the crate LS1 engine and transmission from him. The plans for forced induction came about when he decided he wanted another 550 rear-wheel horsepower car. This time, it had to be reliable.
The new engine utilizes two BorgWarner 56mm S200 turbochargers on factory internals. The factory fuel capabilities have been upgraded with 1,700cc injectors from Bosch, and now uses a Walboro 400 in-tank fuel pump, which allows for the use of E-100 fuel in Brazil, where the owner is located.
The swap wasn’t exactly easy, either. There were a number of problems, particularly when it came to fabricating custom turbo manifolds, suspension geometry issues due to the new rear differential cradle, and a few others. Thankfully, he was able to overcome them with the help of fellow forum members.
Many other modifications have been performed to the wagon as well. The brakes have been upgraded to Brembo 4-piston calipers up front, matching 2-piston in the rear, and Hawk HP brake pads all the way around. Suspension duties have been covered as well, using Megan Track Series coilovers, Hotchkis sway bars, and a complete Prothane bushing kit.
There’s a lot more done to this WRX Wagon that we recommend checking out for yourself on SWRocket’s build thread. You’ll be quite impressed with the build quality, and if you’re looking to replicate a swap like this on your own, we can’t recommend SWRocket’s thread enough.