Spied: Porsche 911 GT3 RS 4.2

New spy shots indicate Porsche is working on a new flagship for the 911 range.

New spy shots indicate Porsche is working on a new flagship for the 911 range. The hopped up 911 was seen testing earlier today on the roads of Europe.

With the 911 Rand 911 GT3 RSalready in the lineup it's hard to imagine an even harder core 911, but that's exactly what Porsche engineers are working on. The model seen here is believed to be a new range-topper called the 911 GT3 RS 4.2.

At first glance it appears as though the 911 GT3 RS 4.2 will borrow most of its aero work from the regular GT3 RS, including an over-sized rear wing and pronounced front fender vents. The rear diffuser on this test car looks similar to the unit used on the latest 911 R.

As its name implies, the most notable change over the GT3 RS will be a bump in engine displacement from 4.0L to 4.2L. Those extra cubic inches should net a noticeable advantage over the GT3 RS' 500 horsepower. Sound from the flat-six will exit through a set of unique dual exhaust pipes.

Timing for the market launch of the 911 GT3 RS 4.2 is unknown at this time, but it's possible the newest 911 could debut at this fall's Paris Motor Show. One thing is for certain -- the 911 GT3 RS 4.2 will trump the $175,900 Porsche is charging for the 911 GT3 RS.

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