If I had gone to Concorde they definitely would not have allowed the upgrade :wink: . I did it at a third party installer. The wires going from HU to the front speakers have been cut and I am OK with it :dance . Agree Karan, if tuned well the HU is quite capable. The sub is not fiddling with the leg space as of now. The dimensions are approx 10"x10"X7" and ti fits snugly under the co-passenger seat. If I face any issues, I will get it relocated in boot. With the given dimensions, the space I will lose out in the boot is only marginal. I think to mask the road noise you must try the high speed ON setting in the HU if you have not done it so far. It increases volume with speed and road noise get masked very well :up .