I have a custom sub box made for my civic that a buddy and me made. With the box, subs, plywood for amp mountage, it all together weighs roughly 250lbs. I have taken it out a while ago because I thought it really slowed my car down. Now I know this is alot of weight but does that really make a big difference or was me getting slower just in my head? I know I won'/t be the fastest 6 gen hatch out there but it would be nice to know, because I would like to put it back in without costing me to much in the speed department, not that I won'/t be going over the limit.