Never really been into engine mods - always thought it a bit chav, that was until the other week when after fitting a timing belt for a guy with a Vectra ST V6 - he let me have a go. the car was modified but what a drive.
Got a text off Finlays mate off the other site (irmscher Kris) wanted to sell some 3.0L cams - I had to take them out of the engine but for £70 for all four thought it must be a bargain.
As I was off this week I decided to put them in - well worth it - then fitted a 3.8 bar fuel regulator off a 2.6 V6 £10.54 plus vat (cost price) - the car is a now unbelievable - you feel it force you back into the seat, between 3- 4k its like a turbo kicking in
Next one is a lightened flywheel - not paying the courtney price of £240 - just happen to have a spare one and a brother who is a machinist - sure he can loose a good few KG's off that.
One mod this guy had us fit was a so called lightened crank pulley- a courtney rip off nice and bling no torsional rubber fitted £189 and not much lighter than the original cast one.
If you want to fit a lighter one - go for the Vectra C / later Omega V6 one these are made from pressed steel and are much lighter than the original - not much heavier than the power steering pulley, and have the rubbber torsional damper part fitted, at at around £33 plus vat a cheaper option (cost price).