Join Date: Jan 2009
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Yeah, they are really a bit closer to 1050cfm, however, cfm isn't a great way to compare turbos because there are a bunch of different factors that play a part in air density. Pushing 700hp out of this turbo is a little unrealistic, but it should make a fine bottom charger for anything in the 450-550hp range. One thing to also keep in mind, that exhaust outlet is probably actually 4 9/16" and will work with a 4" pipe. However, the Vband clamp and flange to mate up to it are probably going to run you nearly $150, they are very pricey little suckers.
I had a lot of people try to push me away from the H2e in my twins, because it was "too small" at roughly 64mm inducer. And conventionally speaking, it is pretty small for the bottom charger in a set of twins. The hx55 is a little bigger, roughly 67mm and (I think should be directly interchangeable with my set up). I have no issues with mine, and it will actually allow for quite a bit more fuel, I have some 200's to throw at and see how it does.
So my opinion is, that it will work fine unless you are shooting for numbers higher than about 550. The stock turbo will limit pretty much any set of twins to around that range in hp. However, the hx55 won't flow enough to support a larger turbo up top so that is your limiting factor.
2000 2500 reg. cab 4x4 auto 577hp
09 6.7L QC LB stick, 4x4.
TOTAL PERFORMANCE DIESEL 707-545-FUEL (3835)