The T3 turbo is around the corner. Likely 50 trip. .48 AR. Goal is 350 WHP.
To get ready for the install, I want to determine and start looking for upgraded injectors (have 3-5 bar adjustable FPR, Walbro 255 standing by; FMIC, SB Stage 3 clutch, Carbonio Intake, Test Pipe, clean exhaust done; currently 18 psi at 4000 rpm with custom K04 and TAP chipped (stage 2 "12.5 psi") ECU.

Will 317cc be sufficient (IIRC, those are 225TT injectors?)?

The post below talks about 440cc?
Is new MAF a must to start? Post talks about VR6 or Lightning MAF?

T-Series 300-500+hp
There are a large variety of t3t4's out there. One to fit every goal. These turbo's are journal bearing, where the GT series are dual ball bearing. The GT series spool up faster and hold up better when really pushing the turbo. So why get a t series? They are cheaper, can usually be found for half the price, and they are easier on your clutch and internals due to the more gradualness of the power. Also you can swap in a DBB chra later down the road if you want better spool. The most popular choice is the 50 trim. When pushed the .63 is capable of 400hp+, while the .48 delivers quicker spool and yet still pushes over 300 to the wheels. There is a 57 trim, but it is known to cause surging on 1.8T's. If you up the displacement a bit, it would deliver great power with quick spool.


With any of these setups you'll need Tuning, Exhaust Manifold, Custom Intake, VR6/Ford Lightning MAF, 440cc/630cc Injectors, AFPR, MBC/EBC, Exhaust, FMIC, Clutch, New Mounts, and Walbro 255.