The focus of the American Le Mans Series could be blown apart should rumours emanating from the United States and linking leading LMP1 runner Dyson Racing to a switch to the LMP2 class, and the all-conquering Porsche RS Spyder, prove to be true.

Although no-one at Dyson was confirming as much - indeed the team announced only last week that ALMS veteran Andy Wallace was returning to drive a Lola next year - a source close to the series told Crash.net that he believed the switch to be imminent, with an announcement possibly being made later today [Monday].

Should the speculation be true, the LMP1 class would be left as more or less a one-horse race, with Dyson having been the only team able to consistently challenge the Audi R8 and R10 over the past few seasons. The rumour mill also suggests, however, that Audi may not be back in force next season, effectively leaving the LMP1 category redundant and shifting the series' focus to LMP2.

The Penske-run Porsche operation has already shown that the RS Spyder is capable of upsetting the 'big boys' by taking a 1-2 result at Mid-Ohio in 2006, and the German marque is making the LMP2 machine available to customers around the world for next season. Dyson, however, would be the biggest - and most unexpected - convert, having run MG Lola variants in both LMP1 and LMP2 over the past few years.

The LMP2 class is already looking competitive in 2007 thanks to the Acura-powered arrival of Andretti-Green Racing, Fernandez Racing and Highcroft Racing - two teams from outside the series and another to have run in LMP1. Penske has confirmed that it will be back to campaign its two bright yellow RS Spyders, while class stalwart Intersport Racing looks set to continue.