ive got the same problem as integragsi96. didnt drive my car for bout 1day on a weekend, and it was pissing down, jump in and i see my back seats + floor/ passenger floor are wet as! still havent found the problem, i rkn it could be my left break light letting in water but not 100% sure. unless its the rubbers on the boot not keeping water out probley :S
im in the same boat too mate