So I'm going to be looking into getting lowering links on my 07gs500 and was wondering how low I should go. I'm doing this not for looks but so I can have more then then my tippie toes on the ground. I was thinking a good 4" drop but am concerned if that may be too low. Any advise?

Yeah, probably too low.  Lowest I'd go is 2".  You need to lower the front, respectively.  So keep in mind your limitations on the frontend of things, especially if you have stock springs (bottom out easily already).  Note also, that lowering will more likely force you to take of the centerstand due to clearance issues (also, it is very difficult to raise on stand after being lowered anyway).  One other take-away is the sidestand... you'll have to shorten the sidestand in order for it to effectively rest on the side stand securely.

- Bboy

Thanks for that I have a mechanic who is making lowering links after we look at her tomorrow and will use this info with that.

Hope this worked out ok?  I'm with Bboy on this one, 2 inches should be it.
I lowered my partner's 04 GS using the 50mm (2") lower links.
She was on her toes before and now she has her left foot planted when she stops.
Center stand it just about us less now and needs a big heave to get up. We haven't changed the front falk position so steering is a little slower, but she's on her L plates so that's good for her.
Cheers
Mick

Yeah, I lowered my '04 just under 2 inches... 29" inseam is just enough to make it uncomfortably high on my tip toes for a newer rider.... After lowering it, I scraped centerstand a couple times and took it off before it levered the rear off the ground and took me for a lowside... added risers to the bars to get them out of the way so I could lower it in the front.  Only lowered it an inch in the front, slightly slower turn-in, but not bad at all.  Added shortened kickstand and that completed the lowering project for me.  I have since raised it back to stock height now that I've got some mileage with the bike and only reach with tip-toes. Noticed a bigger difference with the rake change going back to stock height than I did when I had lowered it... Much prefer the stock rake handling for sure, but at the time I lowered it I felt the height was a safety thing for me... didn't want my foot to slip at an intersection and drop the bike or something worse just because I couldn't reach the ground!  ... much different story now though (knock on wood, haha!)

- Bboy

If you can avoid lowering your bike, I'd recommend it. Lowering somewhat compromises handling and safety. Instead, I'd advise one-footing the bike - it really isn't necessary to get both feet on the ground most of the time. With practice, you can use a bit of counter steering to consistently lean the bike towards one side or the other while coming to a stop. I generally prefer putting the left foot down, so that I can apply the brake with the right foot.

I single foot my 650lb street bike with no issues. Even with a passenger.

Easy practice: On a flat surface, practice switching back and forth between having your left and right foot on the ground until you're comfortable.

If you lower the rear, I'd advise you to drop the front end as well. Otherwise, you're compromising the steering geometry. It will induce some wonky steering behaviors.

For race use, we like to raise the rear end by half an inch or so, for cornering clearance and turn-in.