Joined: Sep 2012
Location: Fluvanna County
I have the Barton shifter and bracket (original bracket). Could not be happier. I wasn't having any issues with the stock shifter either ... mine worked fine in my 2012 and I never had any shift issues even when cold.
However, the short throw and the heavy-duty, mechanical feel of the Barton is just awesome IMO. I would never go back.
You have to loosen the stock bracket at a minimum anyway to install the shifters to gain access to the lower, right bolt ... so IMO you should do both. You will however notice more noise ... you make parts more rigid and less squishy and you're getting more noise. Period. Check out the stock bracket with the soft rubber insert and you'll see why. If any increase of noise is not acceptable ... stick with the stock shifter.
I doubt you'd get denied warranty work because of a shifter ... but you always run that risk when you change anything if your dealership are jerks or are unreasonable.
My high RPM, 2-3 shifts are perfect as long as I just push straight up ... sometimes I (for some reason) try to "guide" it into third and that takes me to fifth at high RPM. Just push straight up with the palm of my hand, let the shifter do its thing, and it works every time.