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Are you talking 1 to 2 inches lower in rear or 1/2 inch?
The SG is already lowered by the shocks(1/2 inch, I believe). If he was to go 1 to 2 inches lower, he'd have some serious issues with the ride and rubbing/scrubbing.
If he's looking to lower for himself, he could look into another seat or let Mean City Cycles(sponsor here) rework his stock seat.
I lowered mine an inch and have no issues with it, even riding double.
I just used one of the Slam Kits on ebay. It's solid as a rock and very inexpensive. The ride suffers a bit because it changes the angle of the shock slightly but not that much.
I don't think you could lower 2 inches unless your buddy is super light or he rides smooth roads or it's a parking lot queen.
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