The M Sport + is just the blue stitching + slightly grey-ed out 269 wheels (all 135's come standard with the M Sport pack). The PPK for the N55 is just a chip upgrade, the old N54's included an intercooler upgrade (for stage 2) which is no longer available / required.
How much was the PPK tune? I'm looking at a procede or a dinan down the track myself.
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