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Discussion Starter · #1 ·
This is the current money pit list.

Short Block
Built with K1 rods and wiseco 100mm pistons built and balanced by maxwell performance.

Heads
Stock 2005 sti heads Pocket Ported and assembled with new cam buckets, GSC intake and exhaust valves, BC single spring steel retainers by Headgames Motorworks

Turbo
Ported FP Green HTZ

Intake System
Injen cold air or Cobb short ram intake with a perrin turbo inlet, perrin FMIC, ported throttle body, NA long runner intake manifold and KSTech 19mm phenolic spacers.

Fuel System
Stock top feed rails, injector dynamics 1000 cc top feed injectors and a walbro 255 fuel pump.

Ignition
XS ignition amp, 1 step colder NGK spark plugs.

Exhaust System
Borla header, perrin up pipe, mad dad V2 catted down pipe with a perrin dual tube cat back going to a single outlet muffler.

Extras
Tigwerks oil pick up, Grim Speed light weight crank pulley, grim Speed electronic boost controller, Grim Speed AOS which will have a catch can plumbed in.

Suspension & Chassis
Perrin rear sway bar with perrin end links and mounts. Cusco 3 piece transmission and engine mounts.


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Discussion Starter · #6 ·
Looking good! Just curious, what's the benefit of the NA manifold as opposed to the STi one?
I went with the NA manifold mainly because I like the CFM flow per runner being much more close to each other compared to the sti intake manifold. The other main reason is it should give better mid and top end power due to the larger plenum and larger amount of CFM the runners flow.

Stock 07 STI
Runner 1 284 CFM
Runner 2 280 CFM
Runner 3 280 CFM
Runner 4 274 CFM
Average 279.5 CFM
Runner to runner max variation 10 CFM or 3.6%

EJ25 SOHC Big Plenum Long Runner
Runner 1 304 CFM
Runner 2 304 CFM
Runner 3 304 CFM
Runner 4 300 CFM
Average 303 CFM
Runner to runner max variation 4 CFM or 1.4%

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Discussion Starter · #7 ·
Ported the stock sti intercooler Y Pipe just for practice since I have a FMIC but I will say the stock y pipe looks like a much better flowing device after porting.


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