Headers vs Hi-op manifolds
going by that test my hedman tight tubes do well , considering they drop in don't hit bottom , and because of design should last , hp off by avg 5 torque off by avg of 6 at peak , better numbers at higher revs . not bad
going by that test my hedman tight tubes do well , considering they drop in don't hit bottom , and because of design should last , hp off by avg 5 torque off by avg of 6 at peak , better numbers at higher revs . not bad