There is a little clip that you have to push forward and then slide the knob off. It is in a little slit on the shaft of the knob. (that sounded dirty)
I drew a picture really fast to help, I know it sucks, but I hope it helps.
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04 Cobra
densecharger CAI
BBK off road X pipe
Custom Electronic Exhaust cut outs
Tuning via Diablo Predator
Ported and polished Throttle body and plenum
Line locker (for the smoke shows)
Stock boost
412 rwhp 379 rwtq