Cost me £100. Just remind them that Richard at Tremona only charge £100 and wave pound notes under Tony's nose. Doesn't take them 15 mins. Can change the RON rating too at the same time if your friend wants to take advantage of those extra RON from super unleaded.
You will only notice a small diffrence in preformence and the rev limiter changed, if you have an FRP map and i paid £50 at PB had a copy off FRP155 put on mine.