I run 17's with studded winters and 20's in summer and have felt no adverse differences at all! Other than my winter wheels look like poop I can't tell the difference whatsoever!
probably, my '12 came with an REF (even lower than the RES) with the Alpine system... updated to the RHB and never looked back!
HTH
Richard
Edit... I don't not know if there was a problem with the REF unit but the sound difference with the RHB is amazing.
Those will do the job just fine... There are also those that cut a coil and a half off the top of the factory rears and get the same effect!
HTH
Richard
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