We recently built a 2.3 gt35r (I think it was an ams turbo kit) and tuned it on the stock ecu. At 22psi it made 380 whp (dynodynamics, no correction factor) from 4,000 all the way to the rev limiter (flatest power band I have ever seen). FWIW 380 on our dyno is about 456 on a dynojet.

There were a few flow restrictions that kept the power curve flat so with 280's and a blow through maf setup it certainly would have made over 400 on our dyno or 480 dynojet.

Turbo spooled by 4,000 on the dyno, sooner on the road.

 

I assume that your in europe. Which will lead me to my next assumption.
you guys dont remember than European Roads are ALOT different then US Roads. Thers not alot of Striaghtline highways that go for 600 miles at a time.
let me tell you from owing a 35r on a 2.0 its all gravy after 5500 but Below that, prepare to have lag.

This is what guy from London did with his Fq 340. And what i would suggest to you as well, or least take notes.

https://www.evolutionm.net/forums/sh...d.php?t=251405


For 450 WHP i would suggest a 50 trim, if you want more power i would go with a 3065, 35rs are big turbos. But ment for built motors and 100+ octane.