yo.. i have a small dillema and im pretty sure sum of u wrx fanatics would be able to help me.. when i floor my car and peak out the gears it jerks quite alot.. i thought it might have been my old pod (HKS Sponge type) which i replaced with a new one.. it helped a bit but its still doing it 1 of my mates says that it could be a problem with the ignition system.. love to hear what u all think... thnx alot cya