That is on an 05 which could be a different story. On the 04 they kept claiming a 30hp increase, and when people starting buying them they were gaining about 3-7hp, and those headers are 600+ for our cars. They got totally ripped because they had someone from their board come on gtoforums and posted a dyno of 30whp gained from their headers when it turned out to be an employee of JBA hah.