Contact Us

Please be advised that workshop visitation is strictly by appointment only, please call in advance to arrange a suitable date & time

CHRISTMAS CLOSURE: We will be closed for business from December 22nd 2018 until January 15th 2019.

Office Opening Hours:

Monday: CLOSED

Tuesday: 8:00am - 4:00pm

Wednesday: 8:00am - 4:00pm

Thursday: 8:00am - 4:00pm

Friday: 8:00am - 4:00pm

Saturday: CLOSED

Sunday: CLOSED

*Note, workshop and office can be closed without notice, due to event commitments

Phone: (03) 9789 1576

Postal Address:

PO Box 61
Baxter VIC 3911


Latest News

    📢 Introducing -: MILLDUN Motorsport 📢

    The fresh new face of Grunt Performance!!

    Over the coming days you will notice some exciting changes, but don’t fret.... we are still the same company - same great service & all our existing contact details will remain...
    We are just evolving & are excited to have you all along for the ride! Let’s do this!!

    Introducing MILLDUN Motorsport

    We're on the move

    WooHoo...We're Moving!!! We are excited to announce we are now closed for relocation to our exciting new purpose built, state of the art workshop! Stay tuned for more updates.

    For all enquires or to make an appointment for the new year you can email us at

    We're on the move

    Round 2 – VSCRC - Phillip Island

    Improved Production - Victorian Championship Round 3. April 15th – 19th 2015

    Congratulations to Tony Groves for this 2nd podium finish for the year, finishing 2nd in Improved Production!

    Awesome work by Tony Groves in the Mornington Mazda Racing RX-7.

    Day 1. - Qualifying 2nd & finishing 2nd in Race 1.

    Day 2. – Race 2. finishing 2nd & Race 3. finishing 4th

    Watch out for Tony & the Grunt Performance Team @ Sandown May 15th – 17th

    Photo thanks to - IPRA Victoria (

    Results - Round 1. VMRC - Winton

    Congratulations to Tony Groves on his first podium finish!

    After an eventful test day, Tony came out to show us all just what a talented & focused driver he is, walking away with 3rd for the weekend. 

    Keep an eye out for the Mornington Mazda Racing RX-7 at Phillip Island next month!

    Round 1. VMRC - Winton

    Grunt Performance will be attending Round 1. VMRC @ Winton Motor Raceway ( - 7th - 8th March 2015.

    Look out for Tony Groves of Mornington Mazda Racing in car 80, running in Improved Production.

    For more info on the event visit -

Race Car Preparation & Development

Grunt Performance has highly skilled and trained technicians to cover all areas of preparation & development for your race, rally or high performance vehicle. Grunt Performance is a one-stop shop for all aspects of Motorsport Vehicle Preparation & Development. We provide everything from pre-event check overs to complete race or rally car builds.

Trackside Support

Grunt Performance has highly trained technicians to provide mechanical support at your next event. We have years of experience providing support at all levels of motorsport. Whether you are competing in Gravel Rallies, Tarmac Rallies or Circuit Racing, from Club Level Event through to International Events.


Grunt Performance has a fully equipped fabrication facility enabling us to provide all types of vehicle fabrication. From Catch Cans, Sill Stands, Inlet manifolds, intercooler piping, handmade headers, mandrel bent exhausts, diff housings, control arms, fuel tanks or anything that needs to be custom made.

Roll Cages

Grunt performance has years of experience in manufacturing roll cages of the highest standard. Whether it's a basic mild steel mig welded cage through to a complex FIA homologated chrome moly roll cage. We take extra care in insuring your safety by making sure that all bar work is as close fitting to the body work as possible, and all intersecting bar work joins at the same point.

Body Preparation

Grunt Performance performs all levels of body preparation from seam welding body shells, rust repairs through to wheel tubs and turret conversions, complete chassis design and construction.

Engine Building and Development

Grunt Performance has a fully enclosed “clean room” for assembly of all our engine and components. Specialising in high performance race engines, for a wide range of race classes; covering classic race and rally cars, hi performance street cars, and modern hi-tech turbo engines.

Driveline Rebuilds & Modifications

Grunt Performance has the facilities and experience to rebuild and enhance all your drive line components whether it be rebuilding a diff or fitting a close ratio dog box we can give you that extra competitive and reliable edge.

Suspension & Brake Upgrades

Grunt Performance can provide a full suspension and brake package to suit all types of racing including custom made pedal boxes, radial mount callipers, floating hat discs, coil overs, adjustable watts linkages and much more. We can provide you with the ultimate suspension and brake components up to transform your car into a race winner.

Specialised Components & Custom Products

We have a comprehensive range of suppliers of hi quality products and components. Teamed with our own line of top quality custom products there is no need to look any further.