that's my estimate for my M5/Z8 combo...the ZRX isn't that hard on fronts
I'm running z8's now and love them, i use to get 17000 or 18000 out of m3's so I'm hoping to get better than that from these.
I got 12k out of the orginal BT-015's that came with mine. Hopefully I get the same out of these. More would be awesome, but I'd be happy with 12-15k just coz the handling is so great with the Z8's compared to the BT 015's