When I bought my car in 2006 at four years old (The car not me ) It was a std 115,and it was Okayish..after a couple of years I had it re-mapped to the X-Power 135,(This was before the 160 was available) And it was an improvement.Then when the 160 Map became available PhilT4 did it for me and now I know what the car should have been like from the beginning.It it a lot more "Driveable" in all aspects,But the best is when you are on a good road no need to drop gears to over take you just put you foot down and go.........The difference between 115 and 160 is like Chalk and Cheese...