I don’t know about the SL specifically, but beware using a longer travel shock than stock. You don’t want to find out the hard way that the bike doesn’t have clearance. You may mot know until you hit a full compression drop., which could cause an impact with the frame.
Air shock is the same. Just let all the air out of it. But by then the man has purchased a shock. Maybe a note to specialized factory support would lend some insight.Easy to test with a coil shock. Take the spring off, install the shock, and cycle the suspension and the shock through its full travel.
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