If anyone knows this offhand that would be great...what are the biggest spacers you can use while still using the stock bolts? I'm guessing probably 5mm or 7mm but anyone know from experience? I guess I could go out and measure one of the bolts but I'm being lazy

 

I use 5mm with no issues. I did increase my torque setting to 170nm. I had to add them to use factory knock-off wheels to clear Turbo S brakes.....after dinging one of my new calipers.

 

what quality do spacers need to be? steel aluminum.......I see them from 20 bucks a piece to 400 dollars........

 

I wouldn't buy any that aren't exactly machined for your hub/bolt pattern. Good ones are aluminum that have been machined. There are many out there and most are ok. All it is is a filler between the wheel and hub. It is extremely impotent that they are hub centric otherwise youll have trouble fitting them.