Did you think that you would make any gains from just changing the pipes?
If you want gain, you will have to change the A/C to a stage 1 and then buy a different Fuel Managment System like a Power Commander V unit from Fuel Moto who is a site sponsor.
Then you will have gain and your bike will run not quite as hot, but you won't have as good as gas milage, but it will run much better.