all the torque kicks in low down yes, so in normal driving conditions you can spank a type r, they need a long stretch of road to get speed up.
if i remember rightly it was about an extra £250 on my premium, i delcared it as a "chip increasing power no more than 30%"
specialist companies such as greenlight, HIC, adrian flux or brentacre might give you a better quote on a modified GTI.