Is it possible that part of the issue is complete kits vs. hodgepodge parts, assembly, and tuning? The TVS 1900 on the CTS-V and the TVS 2300 on the ZR1 have the advantage of full OEM R&D and production. Magnuson also has complete kits (manifolds, H/E + intercoolers, injectors, tuning, etc.), whereas all that KB and Whipple do is sell you a compressor. You're on your own as far as fabbing up, choosing your injectors and tuning. This has to be a factor in the dearth of high-functioning screw setups.
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