Thanks a lot guys the reason for starting with the flywheel is a mate got some impressive results on acceleration by replacing the heavy standard flywheel on his V6 Vectra with one weighing 5.5 kilo cost him £500 including new clutch and labour the results provided good value for money. my car has a top manufacturers speed of 139 mph so it is acceleration I am after, the weight of the standard flywheel will allow me to work out the value for money factor I have a company called powerflow who make stainless exhaust's about 20 mile away, but I dont know if the product is any good, anyone tried them?
ps My mate used a company called Courtny nr Norwich for his flywheel but they only work on Vauxhall's