DEFY Performance

DEFY Performance Boxer Performance Tuning has been created as an outlet for clientele to use, ask any tuning and performance related questions, and to make enquiries.

This page is run by Sean Day, former owner and operator of S&J Automotive,
Sean has been tuning Subaru’s, Nissan GT-R’s and Mitsubishi EVO’s since 1999, and nowadays also restores rare JDM classics with his wife Jo at their dedicated facility 🚙 This page will include technical articles, general tips, which include advice on choosing the right performance parts for the desired outcome!

**Advice gi

ven is based solely on our experiences and our understanding of our findings whilst modifying and tuning cars **

Cars that we tune are either being upgraded to improve drivability and fuel economy and/or outright torque and power. We expect that our clients will only be testing and experiencing increased performance at sanctioned motorsport events, as we in no way condone the breaking of any road rules.

26/05/2026

A quick DEFY Performance undercarriage S204 walk-under 🎥

S & J Automotive

This gorgeous S204 will be leaving us on Friday, the undercarriage rejuvenation combined with deep mechanical service ha...
26/05/2026

This gorgeous S204 will be leaving us on Friday, the undercarriage rejuvenation combined with deep mechanical service has come up very nice, see some of the last pics as a contrast to how she arrived here in April - thanks for trusting us with your rare classic Marc and Wendy!

S & J Automotive
Mark Hocking Special Vehicles
FlatFour
Bosch Motorsport Australia

This gorgeous low km “survivor status” S204 is in for a deep clean and underbody mechanical rejuvenation - sourced by Ma...
22/04/2026

This gorgeous low km “survivor status” S204 is in for a deep clean and underbody mechanical rejuvenation - sourced by Mark Hocking Special Vehicles for a long time S & J Automotive client, this immaculate example just needs some solid detailing to further preserve its 20 year age!

The last few pics are what we’ve been up to outside of Subie, EVO and Grp A Touring Car restoration!

GC8 DOC
Ciaran Donnachaidh Topshelf Parts

660 hours into the extensive restoration of this incredible 1987-1996 Australian Touring Car Championship M3🏁 It’s truly...
07/04/2026

660 hours into the extensive restoration of this incredible 1987-1996 Australian Touring Car Championship M3🏁 It’s truly worth every minute given its preserved overall condition and heritage. The ATTC driver line up incudes Jim Richards, Tony Longhurst, Peter Brock, Neil Crompton, David Parsons and my all time favourite privateer duo, Peter Doulman and John Cotter! This car won Australia’s first ever 2.0L Touring Car Championship in 1993 in the hands of Peter!!!
Currently completed is JPS black interior and underbody, and shortly the BMW Alpine White will be applied with the 05 Mobil 1 livery🏁

Bosch Motorsport Australia
SA Motorsport Tyres
Ulx110 Custom Blend Oil
BMW Australia
Adelaide BMW

Happy Easter to all DEFY Performance Clients, Families and Friends! Here’s a cool article on how our Boxer powered Hill...
02/04/2026

Happy Easter to all DEFY Performance Clients, Families and Friends! Here’s a cool article on how our Boxer powered Hill Climb / Circuit cars fared at last weekend’s Tsukiyo Time Attack 🏁

The inaugural running of the Australian Auto-Sport sanctioned Tsukiyo Time Attack took place at the historic Mallala Motorsport Park in South Australia on Saturday March 28 and proved to be a major success.

We have been graced with the presence of yet another early build 22B, 062/400 showed up from NSW for a mechanical and ov...
05/02/2026

We have been graced with the presence of yet another early build 22B, 062/400 showed up from NSW for a mechanical and overall originality inspection! Let’s just say it passed with an A+ save for a fuel tank service a couple of exhaust and suspension detailing items for the fastidious owner. Without question this is the most original and best condition client’s 22B we have seen here upon its arrival, they are all brilliant and beautiful though!

S & J Automotive
FlatFour
Bosch Motorsport Australia
Ali Burrows

While we enjoy assembling this practically brand new TME, we have embarked on what will be our biggest resto of 2026 - m...
13/01/2026

While we enjoy assembling this practically brand new TME, we have embarked on what will be our biggest resto of 2026 - more details to be released soon regarding the Heritage of this timeless piece of Australian Motorsport History, but here she is in bare steel, bruises n all 🏁

Bosch Motorsport Australia
BMW Australia
Adelaide BMW
Adelaide Motorsport Festival

Merry Christmas to all DEFY Performance plus S&J Automotive clients and families as well as our enormous Motorsport frie...
24/12/2025

Merry Christmas to all DEFY Performance plus S&J Automotive clients and families as well as our enormous Motorsport friends group!
Here’s a few pics of the many restoration projects that we have tackled and thoroughly enjoyed over the past three years - our 2026 is mostly going to focus upon the restoration, race preparation and racing of Heritage Touring Cars 😊🏁

S & J Automotive
Bosch Motorsport Australia



Widebody Family Cruise 🏁S & J Automotive
13/12/2025

Widebody Family Cruise 🏁
S & J Automotive

Address

31-33 Woodlands Terrace Edwardstown (postal)
Edwardstown, SA
5039

Telephone

+61427005840

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