I did the RR and the hutch mod together. I noticed a big difference in throttle response. Like you mentioned, the RR will stop air going through the injectors. Air WILL cause injector plunger/tip damage over the life of ya truck if air goes through them. So you are half way there. You also have the peace of mind that your injectors are receiving a pre determined amount of fuel pressure. Sounds like you are getting her all tricked up Simon. Good work m8.