I installed the A103's in my car today. I have 37k on my focus and my mods are in my sig. I noticed much firmer powerful shifts as well as much more pep and power on take off and throughout the rpm range....
2 Sundown X10's in 2.5cuft Net tuned to 31.65hz
SKAR SK-1500.1d, SKAR SK-85.4
Lots of Audio Technix 0 gauge
XS Power 1200,XS Power XP3000
I murder lowssss