i'm sure our oem systems are not 240 watts per channel. i'd say we have 4 channels as i would believe the subs are on their own channel. if that is the case, you are looking at 60 watts per channel x 4 channels or worst case 120 watts per channel x 2 channels. this is a typical way car systems are advertised verses what most of us are used to in the home systems where they rate them in watts per channel not total system watts.