WRX 2003 GT35R Plus Kit Upgrade - Seeking 800hp - 'The Monster'

This was a Youth Group Project, headed by Wayne Mumford. Xcceleration provided the highly modified engine and most of the upgrades, along with technical support. Wayne provided love, guidance and funds for the group project. The boys in the Group range in age from 14 years to18 years old and they learned alot about Subaru and to have patience when building. This experience will last them a live time. Special thanks goes to the best Subaru tech Wayne knows and his good friend Clay Ledbetter.

This project took almost one year to complete, with the attention to detail being AWESOME!


Justin, Carl, Jacob, Robbie,

Michelle, Jered, Josh

and Wayne (Center)

Josh was at work, we will try to get him in some pictures later.


Wayne called and said his unofficial 1/8 mile top speed is 120mph.

He also said he roasted the Exedy Twin Plate Clutch that day, clutch below.

We're now out looking for a stronger clutch....maybe a Triple Plate?

New Triple Plate Clutch

Now we'll see what happens!

WRX 2003 GT35R Plus Kit Upgrade



Xcceleration EJ22 closed deck with EJ25 T-sleeves - capable of 50psi

79 mm billet crank

Calico coated bearings

Oliver billet connecting rods

Wiesco 100mm pistons / moly graphite treated skirts / ceramic coated tops / offset hollow pins

Custom O-ring head gaskets

Xcceleration stage 4 big valve heads and race cams:

Designed for LOW and MID RANGE TORQUE!

Extensive Custom Porting and Polishing

1mm Larger Intake Valves: 22% Increased Flow (max)

1mm Larger Exhaust Valve: 41% Increased Flow (max)

Custom Stage 4 cams 415 lift, Power to 8500 r.p.m plus

ARP head studs

RC 1000cc injectors

APS TGV deletes / with spare ports

APS fuel rails

Modified Magnus intake manifold

Custom built 80 mm BBK throttle body

AP GT35R Turbo Kit:

-Custom GT35R turbo

-Silicon hoses

-Custom uppipe

-Custom Downpipe

-Intake (w/breather line fittings)

-MAF housing and K&N cone air filter

-Adapter for front mount intercooler

-Tial 38mm wastegate with custom teflon steel braided top and bottom oil lines

4-1 ceramic coated header

Xcceleration 3in. Turbo Back Polished Stainless Exhaust with electric cutout

Perrin crank pulley

Perrin radiator hoses

PWR radiator

Hyperflow racing oil sump

Hyperflow oil cooler

Hyperflow billet catch can

APS 725 front mount intercooler / with nitrous chiller

Custom surge tank/custom 12mm fuel lines

Areomotive A-1000 fuel pump

Areomotive A-1000-6 injected bypass regulator

Hydra stand alone ems with launch control

Element tuning Hyramist

Cooling mist tank


Exedy twin plate performance clutch

Billet Subaru WRX 5sp 4 gear str-cut (syncro)                  

Billet Selector forks for 1/2 and 3/4 and 5/R         

Performance Front And Rear Axles

One Piece Aluminum Driveline

AP short throw shifter

JIC magic coilovers

STI aluminum control arms

Cusco rear lateral links

Cusco rear trailing arms

Agency Power Billet Pitch Mount

Whiteline steering rack bushings

Super pro rear diff bushings

Super pro rear support bracket bushing

Super pro gear box cross member isolator mount kit

Cusco motor mounts

Cusco trans mount

Cusco strut tower brace

Cusco type 2 arm brace

Perrin rear adjustable sway bar

Perrin front adjustable sway bar

Agency Power front and rear end links


Rotora 6 piston front brakes

Rotora 4 piston rear brakes


Cusco 6 point roll cage

NRG carbon fiber seats

Team tech 4 point harnesses with cam locks

Sparco harness bar

Autometer c2 guages

Autometer gauge bezel

Carbon fiber triple gauge pod