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650 no question. With mods the n63tu is a 600+ hp monster. Go with the fun factor.
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2015 Bmw 650i xDrive Gran Coupe
M Sports Edition
Carbon Wing
Carbon Front Splitters
Carbon Rear Diffuser
Carbon Grilles
Powder Coated 373m Triple Bronze
CPG intakes
Arm catless downpipes
Arm charge pipes
Custom Snow Performance methanol injection
Custom exhaust, straight pipes to quad tips
Bootmod3 Stage 2
3.5 Tmaps
xHP Stage 3
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