No need to lower it, white line anti roll bars and the 12.5mm rear spacers is all you need.

The 500's came with 6- 8 bhp more than the normal fez due to ford superseding the old 55mm throttle body with the 60mm one.

Get a Mountune c.a.i.s and a Mongoose down pipe and flexi, transforms the way the power is delivered and you get a nice little power gain, up to 165-170 on a 500.