What is the best one to go for?

Going on an 02 STi with PPP

Do they cause any problems etc.

 

Answers to your questions....

Which is the best? at that level of tune, none of them.

Do they cause problems? Well yes if you add it to a PPP'd car, it will probably det the life out of the engine and leave you with a large bill for a rebuild.

The standard air intake is more than sufficient for what the car needs, cold air inductions are no good in the engine bay anyway, you need to be in the wing as otherwise all you get is hot air going back into a hot engine and reducing your power.
Your best bet is to leave the car alone with its PPP map or have the car remapped, forget about the cold air induction and add a decent dry panel filter, it will do more for your car

Tony

 

OK, so thats a big no no then,

cheers

 

In some circumstances there MAY be a case for a cold air kit, however it is a no no unless you are going to have a remap before you give it big licks. The reason for this is simply that, subject to the finer design points of your CAK, you have probably altered the manner in which the air flows past the MAF Sensor. If the air flow is under read then your engine is under fuelled and with weak running you are likely to nip a piston in the bore.