Those mufflers look like you are still running a bit lean already. Find out if the TTS tuner was used or not. There is a lot of performance to be had in just a good tune.
Also check the drive pulley & see if you have a 32 tooth , or a 30 tooth. You will want the 30.
Also check the drive pulley & see if you have a 32 tooth , or a 30 tooth. You will want the 30.