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I have the original K27HF from Kevin and I am actually considering moving to a Garrett.
I have never really driven a stock 930 or other K27's but I can say with the HF I have, boost comes on very progressively. I never felt I got the on/off switch effect.
My reason for change: I am changing CAMs because I need more top end for the track (SC doesn't work well - my power/torque is done ~5500rpm). While I'm at it & from talking to a few vendors, everyone suggests that the GT35r will flow more than the K27; hence my temptation to try.
I am just starting this process, but the downside I can see - cooling. Its more complex because of the water jacket requirement.
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87 930 K27HFS/B&B/Twin-Plug... Megasquirted 
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