To limit power, all forced induction cars were fitted with a 34 mm diameter air restrictor before the turbocharger inlet, limiting the air flow to about 10 cubic meters per minute. The restriction was intended to limit power output to 300 hp although some WRC engines were believed to produce around 330–340 hp. Engine development did not focus on peak power output but towards producing a very wide powerband (or power curve). Typically, power output in excess of 300 hp was available from 3000 rpm to the 7500 rpm maximum, with a peak of 330–340 hp at around 5500 rpm. At 2000 rpm (the engine idle speed in "stage" mode) power output was slightly above 200 hp.
In August 2007, McRae claimed to still be working on finding a seat for the 2008 WRC season, stating that "if it doesn't happen next year, then I won't (return) because you can only be out of something at that level for so long." In 2017, talking to Autosport podcast, David Richards confirmed that he and McRae had talked about McRae's comeback to Subaru for season 2008. Robert Reid was contacted by McRae who asked him to be his co-driver and the pair was due to test together, but unfortunately the test never happened because of McRae's fatal helicopter accident.
Most of the works drivers of the 1950s were amateurs, paid little or nothing, reimbursed their expenses and given bonuses for winning (although there were certainly exceptions, such as the Grand Prix drivers who were brought in for some events). Then in 1960 came arguably the first rallying superstar (and one of the first to be paid to rally full-time), Sweden's Erik Carlsson, driving for Saab.