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I installed the VMAX ported throttle body on my '15 Limited and I'm very pleased with the results. It really shines in daily city driving. I find myself not needing to press the throttle as much to pass cars. Well worth the $150. Pretty easy to install too. My other mod is an AF Dynamic CAI.
 

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Honestly, I was kind of disappointed in the VMAX throttle body. Didn't really feel any difference... I left it on, but I'm not so sure I would recommend it.
 

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No CAI - stock air filter and airbox. I'm not convinced that a CAI on a modern car is beneficial in any way...

EDIT: However, I may not have felt any difference with the VMAX throttle body because I had already tuned my 2012 (changed throttle sensitivity, trans shift points, lock-up torque converter parameters, torque management, etc) - so maybe my custom tuning had already inproved the throttle response to where the VMAX didn't help any more..
 
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