But as Mr Fergus says this is really not the correct car for tuning mate. Any big engine which is normally aspirated can only be given marginal power boosts for a substantial amount of money. That V8 has 350 plus horses from new and you really need to bring her back up as far as you can towards that figure. If its a bigger bang you want then you are better off selling and try the V6 S5 cos she is turbo........