Right, here goes

Sat on the side of my house is my old pfl estate which started off as a 2.5 manual and ended up as a full cream 3ltr manual.
The Diff is the standard (confirmed by jimbob) 3.7 ratio.
My new shed is a 02 plate 3.2 mv6 auto with lots of toys off the options list

Okay the cunning plan is during the next year, I intend to convert the new car to a manual.
Before every bugger kicks off, quite frankly i'm pish board of the car in its current guise and i'm going to loose the will to live unless I can start interacting with a gearstick / clutch again

Yes, its handy when i'm around town but once I find a nice A or B road, I want to frigging DRIVE it not just steer it from A to B

Also i'm sick and tired of only getting 16 mpg (on lpg) around town.
With the 3ltr, I was continually getting at least 20 mpg and around 28 on a run.
Now back to the list

What parts on the old car can I remove and use on my little project ?
Also will the new car need a chat with a tech2 straight away afterwards or is this something that can be done later on when i've got the funds

Any advise greatfully accepted
Tia