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2014 Infiniti Q50S 3.7 Long-Term Update 7

Motor Trend logo Motor Trend 5/27/2015 Motor Trend Staff, Chris Clonts

The 2014 Infiniti Q50S has almost completed its stay in the Motor Trend garage. I'll miss the fabulous interior, agile handling, and powerful-if-aging 328-hp V-6.

One of the things that could be improved, however, was the sound of the V-6. The forerunner of the Q50, the G35 and 37, had a note that was decidedly sportier with a sonorous bite under acceleration and as revs increased.

So when Infiniti announced it was willing to ship us a new bolt-on "sport exhaust kit" that would give the car a better sound, we were more than excited to say yes and try it out.

The mufflers come with an engraved Infiniti marque on each tailpipe.© Provided by MotorTrend The mufflers come with an engraved Infiniti marque on each tailpipe. The kit is straight bolt-on and can even use pre-existing gaskets (which, admittedly, would not be old yet on such a new car). It retails for $681 and can go on any Q50, even the hybrid. I dropped the car off at Infiniti of Beverly Hills for installation. When I picked it up a few hours later, service consultant Melissa had a huge smile on her face. "You're gonna like it," she said. "We all did."

I sped through paying for the install, grabbed my key, and bolted out the door as soon as the receipt was stapled to the work order. I hopped in the Q50S and turned the key.

2014 Infiniti Q50S 3.7 Long-Term Update 7

I heard and felt a nice rumble in the cabin. I stabbed the accelerator enough times to hear a more menacing growl, especially in the lower end of the rev range. And to boot, there were a few nice pops when rpms died down.

The mufflers, made out of stainless steel and engraved with a hologram-like "Infiniti" label on the tips, look pretty sharp even though they'd pop more on a darker color than our Liquid Platinum.

2014 Infiniti Q50S© Provided by MotorTrend 2014 Infiniti Q50S The bottom line: The muffler kit really does improve the experience of driving the Q50S. There's more aural feedback on acceleration and some during deceleration. For some fun I drove a few times through the tunnel that goes under the LAX taxiways with the windows down. While there's no mistaking it for an F-Type, a V-10 Lambo, or a Challenger Hellcat, it definitely adds some weight on the "sport" side of the luxury/sport beam the Q50 balances on. And for weight watchers, the sport mufflers reduce the Q50's weight by 9 pounds over the stock system.

If I were Infiniti, I'd add the muffler kit to all Q50S deliveries to further differentiate it from the rest of the lineup. It makes that much of a difference.

More on our long-term 2014 Infiniti Q50S 3.7:

2014 Infiniti Q50S© Provided by MotorTrend 2014 Infiniti Q50S
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