Hi All

Just wanting to know what can be done to a 2004 4.2 turbo engine to increase power & economy
I know i don't ask for much,

The 3.0lt common rail seems to do ok with a computer upgrade & exhaust!

I assume a 3 inch mandrel bent exhaust will be the first step, I know boosting the Turbo creates power but where do you stop, The vehicle will do the canning stock route one day so it needs to remain reliable

Any suggestions would be fanastic