Noticable gain

[Poodle]

Exhaust makes a big difference to the drive on a stage 1, won't notice much difference without a map though. I shouldn't bother with any changes to your induction, the standard system is pretty capable and the other options all seem to have a tendency to munch through mafs.

Map will set you back ~£120, depends who you go to. My Whippy and HDi Tuning (pro_steve) come highly recommended, also TB205.