iirc mater said he made 5hp from the neuspeed discharge pipe and nothing fromt he neuspeed discharge pipe.
from looking at the pics of the JBS id say they look a liittle better.
here is a pic of the SFS discgharge pipe next to the Oem pipe. which parts do the JBS kit replace?
here is the neuspeed varient
i dont get the neuspeed one. it seems as all they did was shorten the metal pie, throw some silicone at it, and increase the diameter slightly. then charg extortionate amounts of money for it.
I like the look of the SFS kit. the flow characteristics would be vastly improved over the others, but it does away with the metal altogether, hence why i like the look of the JBS kit. it looks that little bit more solid in construction