What is the best way to lower my mustang about 1-1.5 inches?

either cut the stock srpings or buy some from a company like H & R. Its a pretty easy swap ill see if I can dig out a link that goes step by step. Also what year mustang are we talking about?

Its a 2001

Steeda makes a good set of springs. Just installed them in a 89 coupe and its got a killer stance. I have the Steeda's in a 00GT and it was nice.

Its a 2001
Just go and buy some Ford Racing C-springs.. They are cheap, and work great.. You can pick them up for about 150 bucks or cheaper..

I am going with Ford B springs.I dont want to risk going more due to my Longtubes.

i don't recommend going the cut spring way unless you enjoy a harsh ride, but there are plenty of companies out there that make good springs such as eibach, H&R, Steeda and so on