698WHP 2015 STI Build

We recently finished up an awesome project vehicle that visited IAG all the way from the west coast. The client was a ton of fun to work with and we had a great time building a super clean setup featuring a ton of IAG components, as well as many manufacturers that we love to work with.


The car was built with future growth in mind. The PT6870 BB T4 turbo was tuned very conservatively, leaving a ton of room for additional power down the road. Our client wanted to ensure safety on 91 octane fuel. She also wanted to maintain the “boxer rumble” through Unequal length headers. Later on, if the client decides to shoot for more power, it's an easy switch to equal-length and a few other minor changes like wastegate springs and she’s ready for another few hundred horsepower.

Notable modifications include:
Engine: IAG Stage 4 Tuff w/ Stage 4 Heads and GSC S2 Cams, IAG 14mm Head Studs, IAG Fire-Lock Head Gaskets System, ATI Damper
Fuel: Tuned on Flex fuel w/ E85 and 91 Octane (698whp tuned conservatively on E)
Fueling Mods: Aeromotive A1000 FPR, ID2000, Dual Walbro 450’s
Intake: ETS Rotated and Process West Street Manifold
Turbo: ETS Rotated kit w/ PT6870 BB T4
Intercooler: ETS FMIC w/ 4”
Exhaust: Tomei UEL Header, ETS UP w/ EWG, ETS Catless DP, HKS Legamax Premium CBE
Air Oil Separator: Iag Comp
Clutch: Comp Race twin disk