Ight guys I went over to his house today and looked at his car. The amp he has that he wants to install for his highs is an Planet Audio PA2004 400W Mosef 2 ohm stable stereo 4 channel amp, it has a pair of line outs and then it has two pairs of inputs so 4 rca inputs and 2 rca outputs. His subwoofer amp is an Power Acoustik Area 51 540 max watts bridged at 4 ohms from his MTX audio 7500 12. I looked at his power wire thats hook into his sub amp and its like 8 gauge and the fuse at the battery is a whopping 30 amps LOL and the amp for the sub has two 30 amp fuses on it and the high amp he wants to install has 2 25 amp fuses on it. I mean I would like to install the amp to make some spare change, but this needs a pro I think. Well his headunit is a Kenwood KDC-MP435U and it has like outputs that are like a front and a rear but, I don't know if those are for rca's signal. I think when he can drive imma get him to pick me up and then we will take it to this shop I know and see what they would do and charge.