Check with Nelson in Holman Honda in ft Lauderdale, that's my star vendor there he sells me my current SI for MSRP back in 2022, no surprises or extras here in South Florida the dealers are all over MSRP
Nice results I'll be switching to liquimoly 5W30 in my next oil change in about 2 weeks, I live in South Florida and the stop and go traffic is insane even worse with 80°+ degrees ambient temp plus humidity, I'll be sending a sample to Blackstone as well with my current oil 5W20.
You can bump up the viscosity of the motor oil for, I'm using in my 3rd oil change 5w20, I have plans to put in the next one 5w30, I live in South Florida we need that viscosity here since is very warm and humid.
For that reason I change my oil every to 5k miles or 6 months whatever is first, usually I go by the time since I drive my car approximately 30 to 40 miles per day 5 days per week, the weekend warrior is our CR-V to go to the grocery store or the beach.
If you are struggling with money just put 1 gallon of ethanol to the tank of 87 and see how it goes, that should helps to elevate the octane number, my recommendation is not to use that but every wallet is different.
I have a SI model, but definitely something is off there you mentioned something regarding the catch can maybe that hose is the problem, check if it's proper connected to the right. Check if you can find any diagram online about those hoses or maybe a YouTube video should be something simple...
I believe you need to identify first what was the previous modification that brings the issue, if you made all the modifications in one shoot that will be more difficult to troubleshoot, after the smoke test you fixed any other boost leak?
Sorry for the delayed response, I'll be taking the measures during the weekend since I'm traveling at the moment, I can sell you the rear springs only or the whole set if needed.