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The gearing could make a difference. Compared to other cars, the M550i has very tall gearing. I'd have to do the full calcs on the RS7 but it very well could have shorter gearing and feel faster. Or it could simply be a flat, rising torque curve of the M550i vs a possible peaky one in the RS7. An abrupt increase in torque can make a car feel faster than a smooth torque increase.
EDIT: I confirmed by checking specs, The RS7 has shorter gearing in all gears except 2nd.
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2020 X3M non-comp, Alpine White over black : Exec Pkg, ventilated M Sport seats, 20"s
2020 M2 Comp, Sunset Orange/Blk: Orange stitching, DCT, exec pkg, bicolor rims
Gone '18 M550i, '16 X4 M40i, '15 M5, '13 X3 35i, '12 335is, '11 X5 50i, '09 Z4 35i, '08 550i, 06 X3, 06 650i, '02 M5, '99 540i
Last edited by richard in NC; 06-01-2020 at 03:19 PM..
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