i did a search and didnt fin dout much about these... they are emission slegal and are shorties with a Y pipe for $310 at jegs. they are supposedly made for 5.7 TPI cars, how do they perform? power increases compared to other headers? does anyone know dimensions of these? are they 1 5/8 with a 3" collecter at the cat? or am i not that lucky and its only 2.5" at the cat? any info appreciated, thanks!