Does she want to go fast, make noise, or both? I would just do a 3"DP for about $250, that should give her about 5hp stock or 10hp if chipped. The Cat is another $150, if you can't find someone to install it I can do it for $50 on the DP or $75 on the cat & DP. If she wants HP she should get a chip which will take her from 180hp 174ft/lb to 210hp 250ft/lb. I do these also and they run $350 installed.