due to a broken bolt on my stock 1300 stinger i have repaced it (the piece where the cat con is and joining the water box ) by a 1200 one .

before i have do this i don't have any gps or tacho , so i can't give you number , but now i only take 6900 rpm , i don't see why .

i have all the bolt on upgrade + cut head , 3° etc...
i drive a nujet 6.5 and the motor is very strong , but can't reach 7200 rpm in the water .
out is good.