Prodrive has been at work on Subaru’s range again - this time it’s produced performance packs for both the Impreza and the Forester.
Available as a £1,700 kit, including VAT and labour, from any dealer on the Impreza WRX and WRX STI models as well as the XT Forester, the packs boost power and torque.
This has mainly been achieved by reprogramming the ECU, but the rear catalytic converter has also been replaced and the rear silencer removed. The Impreza WRX STI has a new fuel pump.
The alterations do not affect the standard warranty and all the cars pass the Type Approval regulations for emissions and noise.
The changes give the Impreza WRX STI 315bhp – a 39bhp increase – and a larger increase in torque: 332lb ft of torque at 3700rpm instead of 289lb ft at 4000rpm. The dash to 60mph drops by 0.2 seconds to 4.8 seconds, with 50-70mph in fifth now taking 4.3 seconds instead of 5.1.
The WRX’s power goes up to 266bhp, with torque increasing by 74lb ft to 310lb ft. 60mph arrives 0.6 of a second quicker at 5.3 seconds and 30-50mph in fourth becomes 4.0 rather than 5.0 seconds.
The Forester XT gains 29bhp, taking it to 256bhp, and shows an increase of 64lb ft, taking its total to 300lb ft 600rpm lower down the rev range at 3000rpm. The result is 60mph in 5.3 rather than 5.9 seconds and 100mph in 13.9 rather than 16 seconds.