[Rwillia4]

native1,

I agree there is some HP left in the headers but before you spend 2K on header improvements there is probably some other ways to get the extra HP. I don't think header improvements will get the transmission loss below 10% (or 15%). You might see 5% improvement at the crank, provided the original 540HP numbers you have are with the BDR headers. You would probably have better luck with a more progressive cam if a peak HP number is what you are looking for but then your torque will suffer. It is the never ending saga of needing more HP that we all endure!! Good luck

Rob