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The hybrid HX-35/40 was built for those who were looking for better spool up with more potential than the standard HX-35. But the HX-40 works so well that I am not sure if the few hundred RPM spool loss of the HX-40 wheel is worth the trade off of the spool. The larger HX-40 turbine has greater flow potential so I would rather lose some RPM in spool to make more top end. But don't get me wrong, if you have a hybrid, I am sure you would enjoy it as the thing is going to spool lightening fast, and have great compressor flow potential. But if I were making the decision now, and spool was not my #1 concern, I would go with the Pro-40. But I feel that these turbos are not really the way to go now. Bullseye has pretty much phased them out and unless a huge demand pops up, I don't think any more bolt on housings will be poured. The Borg Warner S series are what everyone who thinks outside the box are heading to. They spool great and make good numbers, but they are not as cheap as the Holset turbos. The S-series does offer more options and combos than the Holset's do, so you can match the turbo to the combination that you are running for better results.
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Joshua Goshman
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