i just installed a set of thorley headers in my K5. they sound good at idle,nice and quiet just like a stock manifold.but when im accelerating it sounds kind of "tinny". not loud like a blown collector gasket, just a noticeable tin sound. ive checked all the bolts and all is tight. do headers just sound like this?im thinking maybe its just causs metal pipes arent as thick as cast manifolds and cannot suppress noise as well. my only experience with headers have been on extremely loud exhaust systems where the mufflers would drown out anything like this.