Yeah i have heard that pioneer are a bit but i have never delt with them. What state of tune is the car now ? standard, stage 1 etc ? To get 300 bhp it needs to have green injectors 3 bar map sensor and a new board in the ecu . If you aint got that you can buy it next day from nost cossie tuners ( i recomend woodford garage to service and gives good advice) all that only takes a couple of hours to fit