how can i add more HP to my 4.6L V8 1996 XR7

There is probably a chip available to step up the performance.Check with your aftermarket parts store.

Install a centrifugal supercharger then get it customed tuned

you could get a supercharger off the Shelby or the SVT Cobra, these engines can make 500 horse power with all the right stuff!

the easiest is a bottle of nitrous hooked to your throttle, when you want max power, just floor it!

l had a 4.6 in a t bird grate engine dose work well with a turbo. a change in the air intake like a k&n set up yes there are chips out there to a new set wires helps (high pro.) and a little more spark can help. l could go on for ever but these are the cheapest way to start good luck