Engine seems reliable and holding 550WTQ pretty well, people making 6-650wtq without much issue (so far)
Transmission can hold 500WTQ without much concern, but starts getting questionable beyond that.
Turbos for the most part are fine, but from an “acceptable” failure rate it is concerning. And not easy/cheap to replace.
Huge aftermarket for just about every sort of modification you can think/need.
With FBO, HPFP, LPFP, Injectors and E85 stock turbos are maxing in the 5-550 WTQ with identical WHP.
A few aftermarket turbo options, and at least 1-2 in the works. Pure stage 2s can get about 600wtq/650whp.
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