Using this Billetworkz shift knob is easy. First, make sure your Subaru is a 2004 - 2021 STI or 2015 - 2025 WRX with a 6 - speed manual transmission. Then, simply replace your original shift knob with this one. When shifting, enjoy the smooth operation and the full reverse lockout function. Note that this knob is not suitable for CVT or automatic transmission models. For maintenance, clean it regularly with a soft cloth to keep the powder - coated finish looking good. Avoid using abrasive cleaners as they may damage the finish or the engraved logo and shift pattern.