the N52 engine. In some areas of the United States, the 328i was powered by the BMW N51 straight-six engine and sold as a SULEV model. In some parts of the world, 4-cylinder models continued to use the N46 engine as the local fuel quality is incompatible with the N43 engine. Diesel Suspension At the front, MacPherson struts with an aluminum hub carrier and aluminum dual lower links forming a virtual pivot point are used. This design was previously used on all 5, 7 and 8 series BMW models. The rear suspension is a 5-link Multi-link suspension, with fabricated steel subframe, fabricated steel control arms, and cast iron carrier. This design is designated "HA 5" by BMW. Wheels The BMW E90+ has a 5x120 bolt pattern with wheel sizes ranging from 16 inch to 20 inch in diameter. There have been 49 original wheel styles produced for this model. Equipment Optional features (some of which are standard on higher models) include Xenon headlamps, automatic climate control, parking sensors, power-adjustable seats, satellite navigation, glass sunroof, heated front seats, Bluetooth and USB audio input. Optional equipment could be ordered individually or combined into packages. Optional interior colours, known as BMW Individual, were also available at extra cost. The contents of the 'Premium Package' varied according to model year and market. It included items such as leather seats with power adjustments, memory seat function, lumbar support, auto-dimming mirrors, a digital compass, auto-folding exterior mirrors, BMW Assist w/Bluetooth, and universal garage opener. The 'Cold Weather Package' includes headlight washers, heated front seats and split/folding rear seats with a ski bag. The 'Sports Package' includes a leather 3-prong sports steering wheel, sports front seats, 18-inch wheels, sports suspension and an increase in the speed limiter to . The 'Technology Package' includes iDrive, navigation, keyless entry ("Comfort Access"), selectable driving modes ("M Drive"), HD radio and Electronic Damping Control. The 'Performance Power Kit' (PPK) was introduced for the 335i and was available for installation at BMW dealerships, it included a tune that boosted engine output for the 335i to & for automatic transmission vehicles and for manual transmission vehicles, an overall gain of & , BMW claim their engineers have tested and designed these Performance Power Kits in such a way that equipped vehicles would not sacrifice reliability or fuel consumption, the result was a claimed 0.2 second decrease in 0 to times, the kit was