Ive got a 98 STi4, Ive got a stainless steel exhuast and a K&N induction kit on it and Im planning to put a dump valve and a downpipe on it in the near future. What is the next step after this tuning wise to get more power out of it?

 

Don't do any more tuning.
Fit an oil cooler, then think about other mods.

 

cheers mate, any idea of the cost of one?

 

Do you really need an oil cooler at this stage? Many guys have more mods on their car without an oil cooler,though it would be sensible to monitor the oil temp especially if doing track days etc.I would have thought that changing the rest of the exhaust and then thinking about a new ECU to make the most of them(IMHO)