I wouldn't worry about the knock sensor. I never had any trouble with it before that I could tell, even with the numerous dyno runs. It may just be certain cars have sensitive sensors.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
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'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black