There's definately more power and it doesn't feel like the truck lost any low end. A 12mm flex head gear wrench makes it a lot easier to tighten the header bolts. Make sure you remove the exhaust manifold brackets on the bottom during installation. There's a lot of room when the brackets are removed. Both headers went in from the bottom. The driver's side header is a little tricky because of the steering shaft but it goes in without removing the shaft. I just had to bend a wiring harness bracket and zip tie the wire out of the way so it didn't touch the headers. It's the wire in the pic. It runs down to another bracket on the framerail which is the one I needed to bend.