Good day:

2x Alfa 4C
Alfa Montereol
Jaguar XFR-S
Jaguar XKR-S
Jaguar XK120
Jaguar E Type
Porsche 997 Turbo
Porsche 930 Turbo
BMW M4
2x BMW M5
BMW M6
Mercedes CL63
Mercedes S65 (new gen')
2x Mercedes S63
Mercedes SLS
2x Mercedes CLS63
2x Ferrari California
Ferrari FF
2x Ferrari 458
2x Maserati GranTurismo
3x Maserati Quattroporte
Maserati Merak
Nissan GT-R R35
Audi RS6 Avant
RR Corniche

Yesterday:

Notable Cars:
Range Rover Autobiography
Panamera Turbo S
Macan Turbo
Macan S
Model S
M3 E92
S5
Old Studebaker.

What type of Studebaker?

No clue

Maserati quatroporte x16

Maserati granturismo x7

Lamborghini aventador x3

Lamborghini Gallardo x4

Bentley continental x17

Ferrari enzo x2

Ferrari 458 x7

McLaren 650s x7

Ford gt

Mercedes GT //AMG!

and more, too many to name.

Bentley Continental Flying Spur x2
Maserati Quattroporte x2
Aston Martin V8 Vantage
Porsche Macan
2016 F-150
Porsche 911 Targa
M5 x5
M6
X6M
CTS-V wagon
GLA45 AMG
Touareg V10
Jaguar XK-R x2
S7
SQ5

Ferrari LaFerrari x2
Lamborghini Murcielago
McLaren MP4-12C
And a bunch of other ferrari spotted and at the Ferrari dealer

SLANTNOSE 930 TURBO!!
Morgan Roadster!!! First time seeing one
Ferrari 458 Speciale
Ferrari 458 Italia
Ferrari 360
991 GT3
911 GT3 x2
Alpina Z8 roadster
991 Turbo S
Vanquish Volante
V8 Vantage
DB9 Volante x2
Rapide x3
Continentals x12
Ghibli x3
GranTurismo x3
Quattroporte x4
GTR x2
Rolls Royce Corniche
Rolls Royce Phantom x2
Rolls Royce Ghost
Rolls Royce Wraith x2
Continental Supersports convertible
R8 V8
Elise

Audi S7
BMW M3 E46
Chrysler 300 SRT8
Jaguar XFR

Lamborghini Gallardo
Rolls-Royce Ghost
Bentley Continental GTC
BMW M6
BMW M5
Chevy Corvette Z06 C6
Porsche 911 Targa 991
Porsche 911 Turbo S Cabrio 991
Mercedes G63 AMG
Tesla Model S x17 (never seen so many of them in one day)

Yesterday:

Street:
Gallardo
F Type V8
GranTurismo
74 911
Flying Spur
Continental GT
Cayman GTS
CLS63
M6 F10
Ghibli
Silver Shadow

Dealer:
246 Dino
512 BBi
458 x13
650S
430 Scuderia
Vanquish
12C x3
FF x2
DB9
Cali T x3
DBS
Rapide
V8 Vantage
430 x3
360
GTR R35
M4
B6 Alpina
Cali x9
GranTurismo x10
612 x2
Quattroporte x3
Ghibli x18

Notable Street Spots:
New S63 Sedan
New E63 Sedan
991 4S x3
2015 STi
New M3
Jeep SRT8
S6
2015 Mustang x3
CTSV Coupe
Cayenne Turbo S x2
ISF
S7
Macan Turbo
Macan S x2
Old S8
Panamera Turbo S
Old S63 Sedan
S4 x3
Model S x14
CL63
S5 x5
Raptor x3

Rossion Q1
Bentley Continental GTC
Bentley Continental GTC Speed
Bentley Mulsanne Speed
Bentley Flying Spur
Audi R8 V10 Plus
2 Audi R8's
Maserati Quattroporte
Maserati Alfieri Concept
Alfa Romeo 4C Coupe and Spider
Alfa Romeo 33 Stradale
McLaren MP4-12C
Lamborghini Gallardo Spyder
Corvette Z06 Convertible
Ford GT40
2 Ford GT's
Acura NSX
Mercedes AMG GT-S
BMW i8
2 Porsche 991 Turbo S
Challenger Hellcat

I have quite a similar list to that from yesterday, hehe.

Ferrari 599 GTB
Ferrari FF
Ghost LWB
Maserati 4200 Spyder
GTR
Viper
Model S
Jaguar XKR with a Spirit of Ecstacy on the front.

I'm assuming your were up in Detroit too haha?