You guys suck now I want a set. $2999 is a bit pricey with cats. Anyone who has these installed please chime in. Looking for some experience with the catalyst version.
2013 BMW Alpina B7x SWB Alpina Blue, Dinantronics Stage 2 600hp, 612lb/ft (Sold!)
2016 BMW X5M Long Beach Blue, M Perf parts, RKP diffuser, Dinantronics Stage 1
awaiting 2017 Alpina B7 (to replace the B7)