At Silverstone, McLaren introduced revised aerodynamics to the MP4/4, doing away with the turbo "snorkels" (which force-fed air to the turbos) located on the top of the side pods. While this proved troublesome on the first day of qualifying, with both drivers feeling it created an imbalance in the cars, and the snorkels re-introduced for the rest of the British GP weekend, it was the last time the snorkels were seen on the MP4/4s for the rest of the season, as testing before the next round in Germany had shown the imbalance was caused by incorrect settings to the car's suspension and not by the removal of the snorkels. Team boss Ron Dennis estimated that the Research and development on the revised aerodynamics had cost the team somewhere around £150,000 for something that was purely an aerodynamic gain and gave no extra horsepower to the Honda engine.