Reviewed By Bryan H (Scottsdale, AZ) Reviewed for a 2002 GMC Sierra —11/21/2006 4:00 PM
I put the throttle body spacer on my 2002 GMC Sierra 4.8L in about 45 minutes. The instructions were great. I noticed a better throttle response and a little more power in the midrange but nothing drastic. The 'whistle' sound is barely noticable, unless you are really listening for it. I have not noticed any gains in fuel milage yet. I am going to put dual exhaust on next, hopefully that will spice up the engine a little more!