Any fully metalized type of tint with a lifetime warranty is ideal. Stay away from Dyed tint. What state do you live in? Different states ave different laws. I personally don't liek ti too dark because it reduces visibility at night. I wouldnt go darker than 20%, but if you want limo style tint, then 5% in the rear windows would be your pick. Also front windows usually have different laws, and check them out fo ryour state as you might prefer having the same darkness tint throughout the entire car.
I do LLUMAR ATR 15% on all of my vehicles. Then I go with ATR 30% on the whole front windhsield. It's illegal in Alabama but it's a chance you have to take! LLUMAR is what I swear by and it's the only tint we use at the shop I work at.
__________________ -1998 BMW 540i6(Axis Penta 20's,M5 shadow grilles,trunk lip,led tails,oem front lip,PIAA lighting)
-2002 Cadillac Escalade(Zinik Luina 22's,OEM HID upgrade)
get a pro to install it. Nothing looks worse on a car than poorly installed tint. Besides, most places will give you a lifetime warranty on installation. I have 35% platinum tint on my M3. It has a slightly reflective quality to it (yes, it is illegal, but I like it anyway.)
__________________ 1997 E36 M3 - running stocker style right now...
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