on my car, 95 rs, two bolts hold the backsteat on. Just pull out the bottom and undo the bolts on the bottom corners of the back at the hinges. weighs a good 30 lbs, i'd bet. Low backpressure (removing exhaust can achieve this) is good if your forced induction, if you're na this can hurt you , yes in the bottom end but you have to have bottom end to run a good time as well.......