// legal tuning · advisory and TP registrations
Build the car you want. Legally — and without hassle from inspections or police.
We'll help you put together a build from parts that carry homologation (ECE/ABE) or come straight from the manufacturer — and what needs to be registered in the vehicle papers. No guesswork, no failed inspection.
// what you're dealing with
Catch a problem before the inspector does.
Declare the right things, the right way.
Know the rules before the roadside check.
// what we offer
Tell us what car you have and what you're going for — power, sound, looks. We'll put together a concrete list of legal parts (OEM performance, ECE, ABE): homologation status, whether it needs registering, and a cost estimate for each. A build that passes inspection and a roadside check.
Build a plan →Got a part or modification and don't know how to get it into the registration papers? We'll assess the route (ECE / assessment / registration) and connect you with an accredited inspection body or technician who carries out the registration. You don't have to navigate the bureaucracy yourself.
Get help registering →Just want to check if a modification is legal? Browse the guides, ask the AI, or check the forum — free.
Legality guides →// why us
Most guides online still cite vyhláška 341/2014, which was repealed in 2023. We work from the law actually in force (zákon č. 153/2023 Sb.).
We build cars legally this exact way — we know which parts carry homologation and which ones most people never find.
The goal is a car you don't have to worry about at a technical or roadside check.
// ask for free
Ask about any modification.
Describe what you're planning — AI searches the web and answers with sources. For verified data on selected mods, see the guides.
This answer is AI-generated (Anthropic) from a web search and is not legal advice or a binding assessment. Verify with an accredited inspection body to be sure. How we handle your question and IP address.
// latest guides
Brake system upgrades — discs, pads, sport kits
All vehicles
The brake system is the safety-critical assembly of the car — larger discs and sport kits almost always require homologation and a registry entry.
Legal with registrationLowering the suspension — sport springs and dampers
All vehicles
Sport springs, dampers, and height-adjustable suspensions need homologation or an assessment, and often require a registry entry — what to check and what to watch out for.
Conditionally legalSpoilers and body addons — legality and safe installation
All vehicles
A spoiler or diffuser isn't a problem by itself — the issue is sharp edges, insufficient mounting, or interference with the car's safety features.
FAQ
Yes, with a homologated kit and a technical assessment. You'll find approved kits and the process in the guides section.
If the exhaust carries an E homologation mark matching your model, no registration or approval is needed — the inspection then just checks the mark and the part's condition.
A vehicle with an unapproved or unregistered deviation from its registration documents will fail inspection until the modification is registered or reverted to an approved state.
An insurer may reduce a payout for an undeclared material modification. It's safe to declare the change and keep proof it was carried out legally.
// let's do this
Pick what you need.
Submitting is free. We'll reply with an assessment and a ballpark price; the actual work is a paid service.
Tailored legal build
A concrete list of legal parts for your planned build.
Help registering a modification
Assessment of the registration route plus a connection to an accredited body or technician.