F/S: Moded Upper Plenum and OEM Lower Plenum
nah, sorry never dyno my car with this plenum or yet never put my car on a dyno run. when i had this plenum on my car i can hear more air flow passing. i have 03 coupe so i think it's non rev upper and lower plenum. let me know.
why don you go take a photo of your oem upper plenum and compare with this one. i didn't make this myself, but why would someone just make welding marks on a plenum with no modification. come on...



From the profile, it doesnt look like the inner volume was increased at all.