Have a look at the guide section mate, you want the thread about stage 2 on hdis. What you're describing is just known as stage 2. As said before, if you don't want to have to sort out a new clutch to cope with the torque, talk with Steve or mapper of your choice to discuss what you want.
I found one of each of the lower pipes in my garage last night by the way, drop us a pm if you're interested.
I found one of each of the lower pipes in my garage last night by the way, drop us a pm if you're interested.