You won't find a (good) downpipe that fits to your standard exhaust.
You standard exhaust is 2" and you need at least a 2.5" downpipe, otherwise you are really just wasting money. You want a different downpipe to stop the restrictions for the turbo, hence the bigger bore sizes.
What you can do is buy a reducing clamp, which fits over the bigger downpipe and connects to your original exhaust. This is what I have now too, as I don't have the money to order everything at once.
And I am also going for the Jetex system.
As for the sequence of mods, I think its a wise choice to do the exhaust, then downpipe. THe TIP is always a nice modd, as it makes your turbo sound awesome!
Then you can chose to fit a K03s, which will keep the boost better throughout higher revs.
And get off that azzzz and fit that FMIC!

