Reviewed By james b (CHAPMANSBORO, TN) Reviewed for a 1999 GMC Sierra —3/12/2016 12:49 PM
dose every thing it said it would . I can really tell a difference in performance!
Reviewed By Logan D (ALLIANCE, NE) Reviewed for a 1999 GMC Sierra —6/17/2015 5:17 AM
It was easy to install and also had a great appearance for my 99 Sierra. Overall, I was impressed with how easy it was to install and also the performance I got out of my truck right after installation! A+
Reviewed By PAUL C (Crestview, FL) Reviewed for a 1999 GMC Sierra —2/26/2012 5:35 AM
My truck has gone from some meek, muffled 5.3L 99 GMC Sierra to "holy cow can you believe the sound of that thing!" Nice...NICE rumble on cold crank and smooth on idle. Exactly what you want. Inside, the high RPM, low gear tone can get defening for a SHORT time. Under power...hoo boy...nice baby. Cruising speeds, hardly notice it at all and that's what I was looking for. Big bang in town, nice and sweet on the highway. Get this system.