Exactly what RDM said. The closer to the amp the better. I didn't use an OE bolt, I just put a new one into the floor of the trunk, but an OE bolt is a better idea. BTW what is the RMS wattage of both your amp and subs? That is far more important than the peak wattage. And what kind of subs are you using out of curiosity? I have a 12" JL W0-v2 Audio with a 360 watt TMA amp.