LBMs have been tested time and time again and every time they always win over every brand of headers available in every aspect. They flow much better, produce more hp, sound MUCH better and they do NOT leak, tick or have heat issues. They are basically the ultimate factory header hands down! Then to top it off, there are headers out there that cost as much or more, why anyone would opt to go that way is beyond me...

Same goes for Pontiac intake manifolds and heads too. Bottom line, Pontiac engineers knew what they were doing. Look at the flow bench test results over the years that have been done on stock Pontiac intake manifolds, heads & LBMs when compared to aftermarket products. In almost every single case the stcok, cast iron Pontiac parts out performs the aftermarket parts. This can not be said for ANY other division or any other auto mfg. The Pontiac guys from back then were amazing engineers!