hp increase
 

does anybody know the exact HP increase from adding the doug thorly headers and the magna flow exaust?

There actually isn't an "exact" amount gained from the headers. Every car is different and every car will respond differently depending on whether or not the car is stock, the weather, or your elevation. To know for sure, you would have to do before and after dyno runs.

With that said, you should be able to see at least a 10whp gain, if not a little more.

hey thanks for the info just trying to realize my dream of supercharging my car just have to get a lot of numbers first before that happens