i know the debate is forever on going between catch can and oil cap breathers but i thought i would post my findings after several months with catch can and between 3k and 5k miles, when i ported my intake i was amazed at the oil residue on the inside of it. that when i started looking around and bought a catch can. ne way today i pulled it off the car and WOW!!!!!! i couldn't believe the nasty stuff inside.... i poured it out on a white plastic plate and took a pic so i could post it. it is being approved and i will add it shortly. i not sure where this nasty stuff is going when you use a oil cap breather but i for one am not trying to send this into my engine........ anyone that would like to i will save mine for you...:lol: it about 6 oz of nastiness in this amount of time!!! also in my case this would be going thru the s/c and intercooler b4 going into the motor....