well my thoughts are i wouldnt do a 4k turbo set up, i think its a bit of a waste of money to turbo it to get an extra 20kw out of it,
if it were me id prob do more of a 5k turbo set-up to get a little bit more power out of it or just do what every1 does 4age it.
BUT THIS IS ONLY MY OPINION, GOD NO NEED TO GET SNAPPY!!