Why is it that ford mustangs feel so stiff and bulky?

Every mustang Gt from the years 79 up to 2004 feel like they have stiffer pedals suspension and steering than other cars I've driven why is this?

Those older Mustangs where not particularly "refined". For years it seemed American car companies didn't realise that there where roads with corners, and that handling was important to many people. They made some pretty good performance cars, as long as you only wanted to go in straight line. If you came to a corner, they steer like a barge.

A Japanese or European performance car might not have the hp and straight line speed, but it's generally lighter handles a lot better. Every Mustang until the latest model had awful suspension.

Every Mustang until the latest model had awful suspension.