After bidding farewell to the Audi at the Brands Hatch finale, Rob Austin says he's evaluating a number of potential contenders to replace the A4 machine but admits he is still yet to make a final decision over what model to run for next year's British Touring Car Championship.

Brands Hatch marked the final appearance of the Rob Austin Racing Audi A4 after the two-time BTCC race winner announced his team would be dropping the car at the end of this season.

Two DNF's accompanied by an 18th place finish at the season finale meant it wasn't the fairy-tale swansong for the A4 Austin had hoped for while his team mate Hunter Abbott could only muster a best finish of 16th.

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In truth, 2015 hasn't been the easiest of campaigns for the Audi outfit, which translated in Austin failing to step onto the podium for the first time in his BTCC career. But the 34-year old insists it's been an endeavour worth pursuing.

"I wouldn't have had it any other way, I've really enjoyed running the Audi A4. This year it's become a bit frustrating because as a team I think we've done a mega job," Austin told Crash.net.

"My team have really upped their game and I feel like I've stepped up a notch as a driver as well.

"Unfortunately it just hasn't really shown this year! We know we'd be getting better results if we had equal machinery, we've been a bit sandbagged. I'm looking forward to next year."

Austin feels now is the right time to make the change having utilised everything he could out of the RWD Audi.

Back-to-back victories at Rockingham for Austin [2013 and 14'] was the defining glory of the A4's stint in the BTCC.

"The Audi was the ideal car for the rules when they first came out but things changed and from there on it hasn't been the ideal car, but we've known that," Austin continued.

"We've always known there's more performance in the car than we've had out of it. So we stuck with the A4 and developed ourselves as a team. This year we really feel we've maxed it out but with nothing more to come we feel it's time for a change."

Despite having used RWD machinery for the last five-seasons, Austin said he would have no qualms of switching to FWD for next season and beyond.

Austin believes going down the FWD route is the 'safer option' due to the nature of the current set of NGTC regulations.

"We've got lots of conversations going on. We don't what direction we're heading for ourselves yet. We need to decide very quickly because obviously it's a lot of work to build a new car and get the new kit installed so we can develop it all," said Austin.

"I think it's safer to go for the FWD option in this championship. I think with the type of car that is required to be competitive, there are more options available for FWD than RWD. I prefer driving a RWD car but I'm easy. I figure if you can drive, you can drive."