Good numbers. Do you have any other mods? Or is that increase just from the headers and stock exhaust?Good to see another member from Reno on here. I've only seen one other F in the Reno area... maybe it was you? Just got the Sikky headers installed at "Street to Sand" on Kietzke. They have a Dyno and it did, in fact add 49 hp. I highly recommend the upgrade. If you like the sound the stock system produces, you'll most likely love the header upgrade.