Going to order the stuff to give the Scoob a service, just wanted to ask a few questions first if thats ok Its a 95 JDM WRX, fmic, cat back stainless, Apexi filter, nothing special really.. I do plan on getting it mapped in a couple of months and will be fitting a decat, walbro and probably 1 or 2 other bits..

Anyway, I was going to get a set of PFR7B's, will I be ok to fit these now or should I wait until mapping time?

I was thinking of buying a K&N oil filter, is there any gains from using one of these? I.e. Pressure or flow?

Was going to go for a Shell fully synth oil, but which grade? Or should I get a completely different brand?

And should I change the gearbox and rear diff oil, or just check and top up?

Thanks all in advance, Steve