The thing is, it is almost impossible to have an absolutely comprehensive list of brake upgrades. Literally any caliper ever produced *could* be installed on your car with the proper modifications. Nobody does the b6/7 s4 front upgrade because it doesnt have much to offer that similar kits do.
The main thing that opens us up to upgrades is B5 S4 uprights. After that, you can go up to B8's, TTRS, shit even R8 brakes may be an option (Hint hint- VW clearanced 2015 R8 v10 calipers down to $700 per side from $2200 per side. Search "R8" http://www.vwparts.com/parts-outlet-center/index.php If you want them even cheaper, put the PN's into GAP's wesbite and they can be had for $610/piece. Not sure what you would do for rotors since those calipers use cermaic rotors though!)
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