Not sure if you can make a diesel sound good with a loud exhaust! I own a FR TDI but the last thing I'd want to do is make my car sound like a racing tractor! hehe
Don't think a performance exhaust would do that much on it's own. Possibly a DPF delete would make it more responsive, but until someone works out
how to remap the 1.6TDI, decent performance gains are going to be hard to achieve.