As promised in another thread, I'm reporting my findings from my recent ECU upgrade. I have a 2005 X-Type 2.2 Diesel Sport, which pulled really well from low down revs, but quickly faded off after the initial rush. The new ECU program has given a massive kick in the !Removed! from just above tickover, and the power delivery continues right through the rev range up toward the redline. It now drives much more like a petrol turbo than a diesel! With an initial rush of power which now doesn't really back off until gearchange. Although 'off-the-line' acceleration is quicker, it's not where the biggest gain is. The car now charges uphill and the acceleration in 4th, 5th and 6th is akin to an aeroplane take-off! I've 'chipped' cars before but the last was in the days of removing the actual chip from the ecu and replacing them with upgraded ones. Celtic Tuning - www.celtictuning.co.uk - turned up at my house exactly on time and performed the upgrade with a laptop. The difference is astonishing! I decided on CT as their website goes into a lot of detail about the methods they use to devise their ecu programs using their own rolling road tests, complete with exhaust gas temperature monitoring etc to ensure the programs stay within the engines 'safe' limits. I'm not new to mechanics and to engine tuning. I've done my share of engine strips and modifications so I know a thing or two about it. The website didn't give me any indication that they were making anything up, so I bit the bullet and booked. If you're looking for a professional service, easy booking and a hassle free performance upgrade, which won't harm your engine and doesn't adversely affect fuel economy, book it with Celtic! It cost £295, but it was worth every penny!