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908 Posts
Skip on the tb spacer. Just noise and no help! If you have a 2008-11 get a Viper throttle body if you want to improve your performance a little.
As far as the other stuff a little bump in performance but again just for deeper sound from engine.
IMO spend your money somewhere else for upgrades that matter like new control arms or skid plates.
 

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82 Posts
I have the cold air intake and cat-back, on my 2011, the improvement I saw was using third gear instead of second to get up the steep hill to my house. Definitely louder, both air intake noise and muffler, but far from being annoying, and what the hell it’s a jeep, it was never quite from the factory.
 
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