Just my opinion, but get the CDL and go for a bigger turbosetup, i did a cupra BWJ in my mk 5 GTI and a Precision 5558 turbo which ran for a year and a half with a comfortable 489bhp and 546Nm without a sweat, same initial torque as a K04 but it just kept comming and peaked around 4500rpm, fantastic fun and with the right tyres very fast :)