I've had a K & N CAI on Bessy for 2 years and the OEM sleeves are degrading and leaking. I've adjusted my slope injection without making other changes and continue to get lean codes so I know I've got leak somewhere. I've taken the system apart and put it back together numerous times...
So, I've seen pic's of blue sleeves on various motors and want to buy them. They appear thicker and made better.
Who sells them?
I'm $hit green bricks if somebody sez home depot / lowes