Since I run my cars to high mileages and make them worthless I'd rather spend as little as possible, and not do anything the insurance company will throw a fit about! Also exhausts make a noise all the time, a good intake system will be quiet except on an open throttle, which is better IMHO for a car I spend up to 7 hours a day in.
If it was more of a toy, then yes I would, but not on an old man auto estate
