Hey Guys, i need some major help here, i have a 2007 supercrew 4.6, i just slapped on a flowmaster cat-back system with super 40 muffler and a dual exit at the rear, but not quite what i expected for power gain, anyone can help me by telling me what would be the next best thing to do with this truck to wake it up ?

Thanks

 

Welcome to the site. A tuner and an intake would wake it up a little bit. I love my 40 series Flowmasters and noticed a gain in hp after they were installed.