Best Throttle Body Spacer?

[EZStreet]

I'm looking to get a TBS, any of yall have one that you've tried and liked? I'm going for better MPG w/ little or no whistle. I drive a 2003 Yukon 4.8L

 

[RIDE N FLY]

I have a Jet TBS i bought from autoanything. After reading the reviews of different makes i went with Jet. I get maybe 1 or 2 extra mpg. I also read that it didnt the whistle but it does. Its not a constant whistle but a noticable one. Installation was not hard, i had to put Permatex ultra blue gasket maker on both sides due air leaks, since then no problems.

 

[boostaholic]

They are all worthless on these lsx truck motors, save your money for an intake or custom pcm tune.

 

[EZStreet]

They are all worthless on these lsx truck motors, save your money for an intake or custom pcm tune.

Got the CAI and am looking into the tune. How much do they normally run? Do you have to sacrifice Power for MPG's?

 

[boostaholic]

You don't have to sacrifice either, tune will improve both substantially. Check out www.blackbearperformance.com as justin will be the one tuning my denali.

 

[road1will]

Has anyone said how much of a power gain they've realized with a tune from Justin?

 

[boostaholic]

Register at www.gmfullsize.com and search for blackbear, plenty of people getting crazy power and great mileage, I'll be deleting the rear o2 sensors in preparation of the longtubes