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Don't look for the PPK for x28i/xi. Stock 428's are already running sub 14 second 1/4. Adding the PPK to the 328/428 will enable the car to very similar performance-wise to a stock 335/435. BMW would rather the consumer spend a $6k premium on the I6 rather than $1500 for the PPK on the 2L 4cyl.
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2017 BSM M2|6MT|Exec|black kidneys and gills|full alcantara wheel|CF spoiler|Dinan Stage 4|Dinan COI|Dinan free flow exhaust with resonator delete|Fabspeed sport cat DP|BMS clutch stop|465 bhp|4.75/5 stars
retired: 2014 435xi|MPPK|335 bhp|3/5 stars
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