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CIS cant really be adjusted for the fuel needed on boost and have good AFR's across the RPM range while on boost.
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That really depends on how much power you are pushing. Up to 400WHP you can tune a nice curve pretty easy, above that it takes more effort but can still be done. Anything much above 450WHP can benefit greatly from the infinite tenability of EFI. The higher the power level the less tolerance the engine has to not being optimally tuned.
To address the original post, the turbos listed (K27S, K27HF, K27HFS) are custom built turbos by UMW in Washington state. They start life as new K27 parts which are modified and assembled. Your buddy is right, those turbos never existed as a KKK/BW product, those would be the K27-7200, K27-7006, K29, and various "999" K27 and K29 hybrids. You can tell the authentic KKK/BW turbos by the blue and silver tag numbers.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
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