You are starting to be a "regular" there since a car like yours stands out. Also, they can tell how fast you can be by your MPH so I think they are trying to get you ahead of where you will end up anyway. However, I think they should be talking to you and telling you ahead of time what you need to be doing for the "next time" rather than shutting you down after you show up. To me that is a bad business decision. Honestly, I have never heard of the plastic overflow bottle thing One more bit of advice is to never argue with any track employee. It is their sandbox and they will tell you to take your toy and go home. Unless you have a lot of local tracks to choose from, just swallow your pride and do what they say. I would also try talking to them and be proactive and ask them if there is anything else that you may eventually need to fix or update so you don't get rejected again if it starts going faster. If you take the approach that you want to be as safe as possible, they probably will stop looking so hard at it.