I am about to go T4 on my truck and want to know the pros and cons and get feedback from you guys who have done it on the better kit. CSD or Irate. The main differences I see are what looks like a 2 piece down pipe on the irate kit along with returning oil to a different place. I know the CSD kit reuses the cold side IC pipe as well which doesn’t seem like a big deal to me. I want the best fitting kit as I use this truck daily for work and towing my camper on long trips. Has anyone had any trouble with the corrugated drain tube on the CSD kit?