Infiniti has introduced a performance vehicle collection called the Infiniti Performance Line (IPL) in the US. The first IPL car is the 2011 Infiniti Performance Line G Coupe.

“IPL was conceived to create a new premium performance envelope. IPL brings all the elements together, styling harmonised with performance, exhaust note with acceleration feel, ride comfort and confident handling. It’s the perfect formula for unmatched driving exhilaration,” said Infiniti Vice President Ben Poore.

The IPL G Coupe is based on the second-gen RWD G Coupe. Exterior changes include a dramatic front and rear bumper design with integrated fog lights, sculpted side sills, rear spoiler and chrome exhaust tips. Those new 19-inch IPL split 7-spoke graphite-finish wheels (wrapped with Bridgestone Potenza RE50A tyres) are really eye catching too. Just two exterior hues are offered: Graphite Shadow and Malbec Black.

The IPL G Coupe’s enhanced performance comes from three areas – engine tuning, dynamic tuning and sound quality/acceleration feel tuning. The IPL exhaust is a full dual exhaust design with independent left and right pipes. The muffler’s inner structure and materials have been tweaked to reduce pressure and provide an “appropriate performance exhaust note”. The result is a 30% reduction in exhaust pressure versus the standard Y-pipe design.

The VQ37HR 3.7-litre V6 engine management system has been recalibrated through air-fuel mixture and ignition timing optimisation, raising the max horsepower output point to 7,400 rpm (from 7,000). The torque curve has been tuned for linearity “to obtain a natural acceleration feel”. The IPL G Coupe makes 348 hp – 18 hp more than standard – and 374 Nm of torque (+8 Nm).

The much praised G Coupe handling should be even better here, thanks to revised spring rates – increased by 20% up front and 10% at the rear. The shocks have also been tuned. The IPL G Coupe also offers a “sport-tuned steering gear”, brakes with aluminum-alloy opposed calipers (4-piston front/2-piston rear) and a viscous limited-slip differential.

Very seductive. Check out the gallery after the jump.

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