I have a 99 supercharger and it has a 170,000 miles on it. Ive read good and bad things about magnuson and im wondering if that's the only place to send the supercharger to get refurbished? I live in WA and i wish their was someone here that could make it brand new.
Also does anyone have any other ideas for what i should add to the supercharger to get better gas mileage.

 

Magnuson or PSE are your two options for full rebuilds. While I had a good experience with Magnuson (see my review) and had a really bad experience with PSE, some folks had the exact opposite experience.

As for your second question...do you have "control" of your SC'r? In other words, do you have the much-needed fuel/timing mods so you can tune your rig? If not, do some reading on Gadget's site and check out URDUSA.com for all the stuff you can get.

People will tell you that everything runs "just fine" with no fuel/timing mods, but they're simply tempting fate. And by the sounds of one of your other posts, it looks like you may have some big problems related to this (can't exceed 4K RPM without it sputtering right?)