If, as the rest of car-loving Australia has been, you’ve been following the Mustang phenomenon, you’ll know that Motor devoted this year’s annual Hot Tuner hoot-nanny to this very vehicle.

You will also, therefore, be aware that this car, the Mustang Motorsport R727 took home the silverware when the sums were added up, the tanks refilled for the drive home and the busted bits and pieces from some of the other contenders were shovelled up and binned. The R727 was not only right at the top of the Hot Tuner results for acceleration and lap times, it was crushingly effective in the way it got there.

A low 12-second quarter speaks volumes, but so did the racetrack-friendly tyres and the competition-spec pads on board at the time. And, of course, that’s how Hot Tuner is traditionally won: you fit track-smart gear and hand out a big can of ass-whoop to anybody else who shows up.

The thing is, however, that those track-savvy bits and pieces don’t always add up to a car that you’d actually want to drive any distance in the real world. Much less pay for to make it your own. So the question becomes one of whether modern advances in the art of tuning have managed to blur the lines a little between what is track-righteous and what is real-world friendly. Or are the two disciplines still mutually exclusive?

Or, to put it another way, is the racy Mustang Motorsport R727 a viable proposition in the world of speed humps, speed limits and snoozers in SUVs? Or is it a real-world turkey that wants to divide its time between killing you and annoying others?

In the interests of such pure scientific endeavour, we managed to borrow the very same R727 that ran at Hot Tuner and took it for an extended drive, both through the ’burbs and into the bits of Australia where cows outnumber Mustangs. So, the first thing to check is what bits of the R727 that made it such a Winton weapon have been changed.

Turns out, very little.

The front hoops have been changed to a more road-friendly compound, but still have ‘Michelin’ moulded into the sidewall, and still measure a monster 275/35 20 (305/30s out back) so they continue to utterly fill the guards.

Also, you no longer need heat in the front tyres to get the car to bite and, had it been raining, we probably would have been even happier (certainly more relieved) with this particular change. The only catch is some serious road noise on coarse-chip surfaces. Although it has to be said that the Michelins are hardly on their own there.

However, there have been a couple of other changes to the set-up of the R727, and both of those changes should cancel out criticisms of the car we had at Winton, even if they helped make it go as fast as it did. For a start, the brake pads have been changed from the race compound we sampled at Hot Tuner for a compound that is vastly more agreeable to the ears.

While you can’t fault the race-compound pads for hauling you down during multiple laps of Winton, they did feel and sound kind of grainy and, if you’re going hard enough on the road to require the stop-after-stop performance of the race items, you yourself probably want locking up. So no problems with that change.

Secondly, since the need for ultimate corner speed is replaced, in any decent road car, by a requirement for a combination of grip, stability, feel and feedback, the car got a new set of front-end alignment settings. Combine the new alignment with the different front tyre and it should transform a car that, at Winton, didn’t want to tell you a whole lot about what it was up to. A bit like a sulking teenager.

However, that’s it for variations on the R727 theme. Everything else is exactly as we tested it at Hot Tuner, which means this could go either way. We could easily be dealing here with a car that simply doesn’t work in the real world, despite (or, in fact, because of) its race-track credentials. When you look at the R727’s spec sheet, it’s quite apparent that there is some serious stuff going on here.

The mechanical basis is Mustang Motorsport’s Level 4 package which gets you a total of 543kW, courtesy of a Roush supercharger and an exhaust system also from the House of Roush. Local suspension geniuses Shockworks supply a set of coil-overs which are adjustable and, in this case, have been backed off to their comfort setting in the interests of making for a proper road car. Yes, it’s another change, but it’s easily reversible at the track, so we’ll let that one slide.

It’s also important to note that, as a road car plying the Queen’s highways, the Mustang Motorsports deal is fully compliant (and complied) with all relevant ADRs and emissions standards. The secondary manufacturer’s compliance plates in the door jamb confirm that status to anybody who cares (or needs) to know exactly what’s what.

If you don’t want the frills and bells, then your spend to this point has been a neat $24,250 provided you stick with the stock brakes and tyres, but the R727 is a bit more special than that and incorporates a retrimmed interior, the 20 x 10-inch and 11-inch (rear) alloys and even the steering wheel from the Stateside GT350. Put it all together and you’re looking at around $56,000 over and above your Mustang GT auto. And we’ve gotta say, that interior does make things a bit more comfy for a longer trip.

But while the body kit obviously aids aero at speed, in the world of driveways, kerbs and merging traffic, the kit reduces amenity slightly while the C-pillar-window block-out panels simply make lane changing more of a lucky dip.

The engine is the gift that truly keeps on giving. The active Roush exhaust means you can sneak away first thing in the morning without returning home to find your neighbour’s garbage on your lawn. Or you can open the valve and just soak up what is a very sophisticated racket. You can even open and close the valve remotely via a phone app – apparently. Although why you’d want to fiddle with the zorst when you’re not around to hear it is the big question for me.

Meanwhile, the gentlest squeeze on the gas has the ’Stang surging forward like a big dog on a short lead. But it’s not tiring, nor does it make you impatient for the traffic to clear. Provided, that is, you remember to shift the drive-mode switch into Normal.

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The Roush retune of the trans has made it a bit too savage in Sport or Track, particularly when you step off a light pedal application at a low speed, at which point the throttle seems to snap shut too abruptly. Switching to Normal fixes it, though, so no harm, no foul. And all the while, the engine pours on the grunt in a way that agrees with the concept of progression.

Too often, blown engines come on too hot and strong, but this car allows you to modulate the pedal and dig only as deeply into its reserves as you intended. And blower whine? Yes, it’s there, but only when you’re thrashing the thing into the upper reaches of the tacho with the butterfly wide open. Other than that, it’s OEM quiet.

With the coil-overs in Comfort, the Mustang rides remarkably well. In fact, we’d say it’s even comfier than a stocker, with less pitch, more control and less roll with just a bit more head-toss reaction in the cabin as a result of the improved lateral grip. And the new wheel alignment settings have eradicated the feeling at Winton that you were missing the mid-corner news bulletins. You still get that trademark Mustang feeling of having an awful lot of bonnet in front of you, but with the fresh angles, you now have a much better idea of what’s happening beyond the bonnet scoop.

Ultimately, the whole package adds up to a car that, if your foot never went near the floor, you’d never pick as modified.

Retaining factory levels of civility and driveability is all the rage right now, and rightly so. If you can build performance without trading off liveability, then that performance comes at a reduced cost. Beyond a slight stumble now and then when flicking between Reverse and Drive (a function of the new Roush engine calibration) I really couldn’t fault the thing provided I remembered the Normal driving mode thing. And when you consider the potential within, that’s really saying something.

Could I live with it? Hell yeah!

MUSTANG MOTORSPORT R727 SPECS:
Body: 2-door, 4-seat coupe
Drive: rear-wheel
Engine: 4951cc V8, DOHC, 32v, supercharger
Bore/Stroke: 92.2 x 92.7mm
Power: 543kW
Torque: 827Nm
Power/Weight: 311kW/tonne
Transmission: 6-speed automatic
Weight: 1747kg
Suspension: struts, anti-roll bar (f); multi-links, coil springs, anti-roll bar (r)
L/W/h: 4783/1915/1382mm
Wheelbase: 2720mm
Tracks: 1582/1648mm (f/r)
Steering: electrically assisted rack-and-pinion
Brakes: 380mm ventilated/slotted two-piece discs, 6-piston calipers brakes (f); 330mm slotted two-piece discs, single-piston calipers (r)
Wheels: 20.0 x 10.0-inch (f); 20.0 x 11.0-inch (r)
Tyre sizes: 275/35 ZR20 (f); 305/30 ZR20 (r)
Tyre: Michelin Pilot Sport Cup2
Price (with kit): $112,490 ($59,990 for Mustang GT auto)