Dennis Aase won the SCCA Pacific Division C-P title in 1973 and in 1974 drove a Porsche 908/2 in Can-Am. He then raced in IMSA eventually getting a drive with the Toyota factory team of Dan Gurney's All American Racers.
Dennis Aase began his career behind the wheel winning his first driving championship, the SCCA Pacific Division C-P title, in 1973. In 1974 he drove his Porsche 908/2 in the Can-Am Series. He finished 7th overall at Road Atlanta on July 7th, 6th the following week at Watkins Glen, 7th at Mid Ohio in August and 8th at Road America. Ending the season 8th overall in the championship. He competed regularly in IMSA through the late '70s before signing to drive the potent BMW M-1 for the 1980 IMSA GTO season. He would win five races in the car over the course of the 1980/1981 seasons.
He continued to race in multiple classes in IMSA, including the prestigious GTP class with great teams such as Akin Motorsports, Moretti/MOMO and the legendary Al Holbert into the '80s. In 1983, Aase's skills as a driver were rewarded with a ride in the Toyota factory team of Dan Gurney's All American Racers. Piloting the GTO class Toyota Celica and later developing the Toyota MK-I GTP car that would revolutionize sports car racing.
He remained at AAR until retiring in the late 1980s. Over the course of his career as a driver, Aase would take his place in the top-10 in all-time IMSA wins and the most pole positions in GTO class history. Not one to rest on his laurels, Aase and his brother, Dave, started Aase Brothers Porsche Car Dismantlers. He would sell out to Dave in 1994 to focus on AASCO Performance.
Aase's talent and long tradition with Toyota led to AASCO running the Firehawk series Toyota factory effort in 1995, preparing Toyota Celicas for the Long Beach Grand Prix celebrity event and pace cars for the CART series. An AASCO-managed team also won the IMSA GT-3 championship with Jorge Trejos in 1995. Since the late '90s, Aase has prepared Porsches for Rolex Series first with EMC AASCO Racing and then with BoDuck AASCO Racing.
In 2002 and 2003, Aase prepared and managed the Porsche Club of America (PCA) on-track effort of Gary Becker, Joe Kunz and Mark Webber before signing to prepare and manage the AASCO Motorsports Porsche 911 GT3 Cup Rolex Series entry in late 2003 and the full 2004 season.