hey arron if it were me I would give xs engineneering a call there TO4S set up is the shit my buddy has a third gen with this set up along with a greddy 33 r intercooler he puts 580 to the ground and hasnt even begun to tap that turbo and its is smooth as butter comes out of vac at 2000 rpm full boost at 3800 he runs 24 psi. Just a side note if you are going to go over 15psi I recommend an apex seal upgrade the stock ones wether it be a jspec or not wont take over 15psi for long. They really dont like going over 12 for that matter. This of corse is for a 2nd gen I assume that is the car we are talking about because I know you have a 3rd gen too. Also you will need a new ecu the stock one wont cut it xs also make the power fc from a third gen to work in a 2nd just have to tell them you set up and they will send it close real close to where it needs to be set. Thats my two cents.