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Address: 23 Reserve road Melton 3337
Holden / HSV Dyno Tuning Specialists
Australia's #1 Commodore Tuner
Unlock the power of your Holden / HSV today!
At Gmmotorsport, we are dedicated to unleashing the full potential of Holden and HSV vehicles through unparalleled performance packages and expert tuning.
Led by Australia’s premier tuner, Phonsy Mullan, we commit to excellence in every detail, ensuring that our customers experience the thrill of superior performance and reliability.
With a passion for innovation and a reputation for quality, we strive to be the trusted choice for enthusiasts who demand the very best. Together, we celebrate the spirit of motorsport, delivering performance that not only meets but exceeds expectations
World Class Dyno Facility
Phonsy, with his state-of-the-art mainline dyno, has perfected tuning for over 5000 Holden Commodores in the past two decades. The unparalleled data amassed during this period sets him apart in the industry. Rest assured that bringing your Holden to Phonsy means you're in expert hands!
Why choose us?
It's hard to find reliable engine builders and tuners for your pride and joy. At Gm Motorsport we are experts in the field with over 20 years of experience and a specialization in LS engines since their inception, we possess unparalleled expertise in these motors.
Avoid the confusion of general auto shops and entrust your car to a reputable and knowledgeable team like us. Let's elevate your driving experience together.
TESTIMONIALS
Proven Outcomes
CUSTOMER TESTIMONIALS
What others are saying about us
Had an OTR and tune done on my wagon, pulled great numbers and couldn't be happier with the workmanship and service I received at GM Motorsports. Thanks to the team!!
-Andrew Smith
Had my car done with a Turbo Killer Cam & Hi-Stall don’t regret it one bit, Awesome Service as Always, more than helpful, highly recommended
-STREETL0W
Over the years Ive had a few cars in for performance work with gm Motorsport, they are very friendly and always answer any questions you have for them, very reliable workshop, highly recommended!
-Daniel Savasta
WHY BRING YOUR CAR TO US?
25+ Years Of Experience
Warranty On Tunes
Skilled Mechanics
LS Engine Specialists
Genuine Parts
