I wanted to clean throttle body so I ordered the spacer to install at cleaning time. Easy to instal. Fits perfect. Engine sounds the same. No codes. Have only drove 1 full tank but appears to have increased MPG by about 2 miles per gallon. Looking forward to see results with trailer in tow. Read that dyno tests show MPG/HP improvements also, so Im sold, installed and happy with my 1st results. Also. Throttle body was dirty and definitely needed cleaned at 107K miles.