[cliffyk]

The OEM plenum is an inherentlyhobbled design, as it could have been made taller and allowed better flow through the elbow.No amount of porting can fix this, all aftermarket plenums are 5/8" to 3/4" taller and produce far better flows that the OEM plenum.[/align][/align]Here is my reformatted and annotated version of Accufab's flow bench data, a link to their original data is provided...[/align][/align]And, as many have said, those HP gain numbers posted in the original thread are a load of crap...[/align]