Why DPi isn't all about Penske versus Joest

Why DPi isn't all about Penske versus Joest

Two of the great names of US sportscar racing are back on the scene, lured by IMSA's highly successful DPi platform. But the technical challenge has changed dramatically in their time away and reputation alone won't cut it

For those too young to remember the IMSA GTP days, the Audi versus Porsche rivalry that reached its peak in the American Le Mans Series midway through 2007 was a high-water mark for US sportscar racing.

On paper, the normally-aspirated RS Spyders in the LMP2 class should have been no match for Audi's revolutionary turbodiesel R10s. But thanks to a series of technical waivers - the ALMS all too happy to see Audi face a challenge for once - and extensive development over the winter, the 150kg-lighter Porsche was a persistent challenger for outright victory on a calendar dominated by tight road and street courses, managing the feat eight times in the season.

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