Personally, I would not change the intake and exhaust. The 95's have the low performance heads and intake manifold, and unless you're going to change those, intake and exhaust will just make a lot of noise.
Living in the snow belt, I would spend the money on undercoating, and a Trak-lok diff with 3.55 gears. That will give you a nice boost in performance, along with getting around in the snow better.
97 T-Bird LX 4.6 - 66k miles
94 Supra TT Auto - street/strip car
04 Crown Vic Police Interceptor - Brenda's car
95 T-Bird LX 4.6 - fully optioned, owned 15 years
96 Cougar XR-7 4.6- Brenda's car, owned 11 years
88 T-Bird 3.8 - first T-Bird, owned 5 years