I need to know what I need to replace,install on my suspension to be able to handle 400+ h.p.

 

The first things I would get are subframe connectors, then a wonder bar. Then depending on how bad your shocks and struts are, I would replace those too. If you want the car to hook better than stock, Lower control arms, and a track bar will help. That would be a good start.

 

Frame connectors, I prefer Alston's