Are you buying new or used? Most combo sets that you buy new come with a 5in backing plate. I'm pretty sure most of us the 5in bp with 5.5 and 6in pads.
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2010 Black 2SS/RS A6
Halltech CF 102 fed
GPI modded intake manifold
Bo (knows) White ported TB
Kooks LT's/ Dynomax VT
Pfadted (springs/sways)
Dyno tuned by Rhino and GPI
I once parallel parked a train.
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