Tim posting has reminded me to raise an important issue.

Allthough you may see cars like Tim's and Oli's fitted with large turbos what you must remember is that these are extremely modified engines with virtually no parts remaining from the original engine. These units cost in excess of £7K and to just choose random parts that are similar to the parts used on my engines to fit to your own std engined RS turbo is only asking for BIG trouble!!

Tim may take the p!ss with regards to others having lag trouble but remember Tim's engine revs to 7500rpm and has similar power to boost ratios as a std cosworth engine and as such is a much more efficient unit!

Remember it's the entire package that works, not just throwing random "hi spec" parts together.