1965 Mustang coupe modifications

You mean anywhere on the car or outside or interior.They do make custom door panels and match quarter panels with arm rest.A package tray with pods for 6x9 even a 3rd brake light.Me id go for h4 head light conversion they are britter led tail lights reverse lights and turn signals 3 point seat belts and a collapsible steering column.Id go the collapsible steering column 3 point seat belts and head lights first.Your wallet is the only limits on what you can do to these cars.

Which cherry bomb mufflers glass packs or the normal looking one.I love the sound of a spin tech muffler it lets it keep the mean v8 sound but not overly loud like a glass pack is.