Maintenance is a relative term along with cost associated, it could be as little as securing a single bolt you find lose to having a fuel issue or CEL pop up and taking a week or more to diagnosis.
As you add more moving parts to a system more is likely to break or cause problems. If someone can be aware and work ahead on doing continual inspections or check ups on the kit, engine, car, etc it helps in the long term to make life easier. Does not mean you won't be going down the freeway and have a major issue just pop up but during routine maintenance check every little part and I would say even more often than that (every week).
No kit can be worry free, the moment you put it on the car you will need to be more aware of what is going on with the car. Is it running a little rough, is the idle off, major throttle lag, fluid under the car, usual sounds. The list goes on and on, it is not a light project to just throw on a SC/TT/T kit and call it a day.
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