The 2005 Labour Day Weekend Grand Prix of Mosport was the eighth race for the 2005 American Le Mans Series season and the twentieth IMSA SportsCar Championship race at the facility. It took place on September 4, 2005. The race was won overall by Dyson Racing drivers Butch Leitzinger and James Weaver in a MG-Lola EX257.

Official results

Class winners in bold. Cars failing to complete 70% of winner's distance marked as Not Classified (NC).

Pos	Class	No	Team	Drivers	Chassis	Tyre	Laps
					Engine
1	LMP1	16	Dyson Racing	Butch Leitzinger James Weaver	MG-Lola EX257	M	127
					MG (AER) XP20 2.0L Turbo I4
2	LMP1	1	ADT Champion Racing	Marco Werner JJ Lehto	Audi R8	M	127
					Audi 3.6L Turbo V8
3	LMP1	2	ADT Champion Racing	Frank Biela Emanuele Pirro	Audi R8	M	126
					Audi 3.6L Turbo V8
4	LMP1	20	Dyson Racing	Chris Dyson Andy Wallace	MG-Lola EX257	M	125
					MG (AER) XP20 2.0L Turbo I4
5	LMP2	37	Intersport Racing	Clint Field Liz Halliday	Lola B05/40	G	120
					AER P07 2.0L Turbo I4
6	GT1	4	Corvette Racing	Oliver Gavin Olivier Beretta	Chevrolet Corvette C6.R	M	119
					Chevrolet 7.0L V8
7	GT1	3	Corvette Racing	Ron Fellows Johnny O'Connell	Chevrolet Corvette C6.R	M	119
					Chevrolet 7.0L V8
8	GT1	63	ACEMCO Motorsports	Terry Borcheller Johnny Mowlem	Saleen S7-R	M	119
					Ford 7.0L V8
9	GT1	35	Maserati Corse Risi Competizione	Andrea Bertolini Fabrizio de Simone	Maserati MC12	P	118
					Maserati 6.0L V12
10	LMP2	10	Miracle Motorsports	Jeff Bucknum Chris McMurry	Courage C65	K	117
					AER P07 2.0L Turbo I4
11	LMP2	8	B-K Motorsports	Guy Cosmo James Bach	Courage C65	G	113
					Mazda R20B 2.0L 3-Rotor
12	GT1	71	Carsport America	Michele Rugolo Tom Weickardt Jean-Philippe Belloc	Dodge Viper GTS-R	P	112
					Dodge 8.0L V10
13	GT2	31	Petersen Motorsports White Lightning Racing	Patrick Long Jörg Bergmeister	Porsche 911 GT3-RSR	M	110
					Porsche 3.6L Flat-6
14	GT2	24	Alex Job Racing	Ian Baas Darren Law	Porsche 911 GT3-RSR	M	110
					Porsche 3.6L Flat-6
15	GT2	43	BAM!	Mike Rockenfeller Wolf Henzler	Porsche 911 GT3-RSR	Y	109
					Porsche 3.6L Flat-6
16	GT2	44	Flying Lizard Motorsports	Lonnie Pechnik Seth Neiman	Porsche 911 GT3-RSR	M	109
					Porsche 3.6L Flat-6
17	GT2	79	J3 Racing	Justin Jackson Tim Sugden	Porsche 911 GT3-RSR	P	108
					Porsche 3.6L Flat-6
18	GT2	23	Alex Job Racing	Timo Bernhard Romain Dumas	Porsche 911 GT3-RSR	M	108
					Porsche 3.6L Flat-6
19	GT2	51	Panoz Motor Sports	Bryan Sellers Marino Franchitti	Panoz Esperante GT-LM	P	107
					Ford (Elan) 5.0L V8
20 DNF	GT2	50	Panoz Motor Sports	Bill Auberlen Robin Liddell	Panoz Esperante GT-LM	P	91
					Ford (Elan) 5.0L V8
21 DNF	GT2	45	Flying Lizard Motorsports	Johannes van Overbeek Jon Fogarty	Porsche 911 GT3-RSR	M	68
					Porsche 3.6L Flat-6
22 DNF	LMP2	19	Van der Steur Racing	Gunnar van der Steur Eric van der Steur Ben Devlin	Lola B2K/40	D	26
					Nissan (AER) 3.0L V6
FINAL RACE RESULTS Archived 2014-08-08 at the Wayback Machine[1]

Statistics

• Pole Position - #20 Dyson Racing - 1:07.682
• Fastest Lap - #16 Dyson Racing - 1:08.596
• Distance - 312.293 miles (502.587 km)
• Average Speed - 124.024 mph (199.597 km/h)