well as far as i know, matt spry is the best, so many people have used him and i havent heard a bad result, so he may be a little more expensive but in the end u will have the best possible tune for the money u have spent there. and for the same power out put i heard he can increase your torque curb dramatically. so it will feel like it smashes u in your seat alot harder. one of my mates has a 33 gtst, with a power fc, bigger injectors, GT25/30 on it and it made 347rwkw, and man that thing is just unbelieveable aye, just smashes u back in your seat. he's coming on the cruise on the queens bday one.