Check the DIY thread on rear brake upgrade. The cheap upgrade for front are Audi G60 calipers and carriers, they came on 5kqt and 200 and v6 90 series. They dual pistons calipers, also use the b4 rotors for right offset, the coupe rotors are different offset. Bigger brakes in front mean you need 15in rims bc additional diameter. There no point to change brake booster or mc either, do a brake flush first and get some good pads like hawk or mintex ferando brake lining, upgrade your brakes line to braided lines. Check out 20v.org or 20v.net. Good info there too.