Review on K&N Cold Air Intake Kit: Maximizing Performance, Boost Horsepower: Fits 2002-2005 Chevy/GMC/Oldsmobile (Trailblazer, Envoy, Bravada) 4.2L L6, Model 77-3036KP by Dewitt Graham

I LOVE this thing so much. It was actually pretty easy to install, the only tricky part was a 1-1/4" hole I had to drill, but other than that the install took about 30 minutes. I have an 04" GMC Envoy with a 4.2 -litre I6 engine. And it fits perfectly. My face cracked a big smile as you hit the gas pedal. The beautiful roar that came out of the engine was just amazing. I've definitely felt the increase in performance and it makes your car a lot louder Sounds SO good I can't even explain it I would definitely recommend it for your car You seriously won't regret it!