i am looking into a system for my 04 gt. a few bolt on's but mostly stock. is a 125 too much? is a single jet system safe , or is the noszle kit a good one for the money? i want to do the best i can without blowing the motor. i have been told a 125 is safe w/the stock motor, what do you think? also what brand kits are good and where are the best prices.?