If you take time to notice, When your tearing down the road, if you look in the rear mirror you actually notice that the spoiler dips on hard acceleration, you do not get that on the V spoiler. It is made from a different grade.
Stick with what you have, the I is the origin, I have a guy in Austria that has been slowly buying the I, II, and III from the UK, he pays silly money, never haggles. He breaks a few here and there when they get shipped over. He Rallies a few that have good engines, but he always keeps the standard ones to one side in a lock up.
He told me that we are fools over here and that when they are all done and dusted, we will beg him to have them back at 10 grand a pop. I just laughed and told him to shut his Ski Suit wearing trap!!
Then I went to Japan for 3 months, they were begging me for mine!!! I got offers of £6k for my III!!!!!
I know where he is coming from.
No matter how many mods you do, always keep your standard bits, you never know when they will be needed.
El