I just bought a 98 GT and was wondering how a colder thermostat like a 180 would affect the car. The car is stock except for a set of flowmasters. Some people have told me it is good for a few horsepower ,but others have told me that it is pointless without a tune. I am to use to carbed 5.0s and don't have much experince with a 4.6. So any help would be great.