Yeap, I checked the price 2 weeks ago, and I have to look the other way. They have optional wireless remote valve flaps control which is very neat. With EV, it is basically $4000.00 without installation.
Also, it isn't CARB approved, so cannot be used in CA.
"products are not EPA or CARB approved and are intended for off-road/track use only"
00 323ci blk, 03 S2000 sil, 04 525i sil, 05 X5 beige, 07 328i sil, 08 C350 gray, 10 MCS Conv gray, 10 MCS red, 12 ML350 BT sil, 13 650i GC blue, 12 E350 Wagon 4Matic blk, 14 MCM sil, 15 911 C4S blk