Thanks for replying.It’s been proved that sparks system puts out more horsepower with all other mods being equal. It has to do with how the headers are mated together. 1/4 and 2/3 vs akrapovic’s 1/2 and 3/4
I already noticed that, however I am not sure if Spark has that configuration in both SS and TI. I have to make sure the only thing it changes is the material.