As Avedis said you downshifted manually, unless you were driving the car for extended periods at those speeds
you have nothing to worry about.
The 3.7 Q50 has an engine that makes most of it's power at higher RPM's just like a motorcycle, so saying
"It sounded like a bike" is actually very accurate.
2009 G37 X - Blue Slate - Michelin X-Ice 3/ Michelin AS/3+ Location: The Great White North
Planned Mods: Takeda Stage II Intakes, Borla Catback Exhaust,
G-Stop SS brake lines, Megan Racing Upper Strut-Tower.
“Passion rules reason, for better or for worse.” - Terry Goodkind