Yet another pikey performance mod Disclaimer: this mod is strictly speaking only legal for commercial diesels in the US. Despite this, it’s a fairly common mod especially for Diesel Jeeps, to avoid problems with their Crankcase Ventilation systems. I know of one person who has been using this mod in the UK for quite some time with no problems. Essential: a 1.5meter length of heater hose and suitable hose clamp (jubilee clip), hacksaw, masking tape and some epoxy glue. Legally required: a c