Chiptuning and mass conversion approval — when a power change is legal
The Czech Ministry of Transport approves mass conversions of road vehicles that change engine power and torque output. If the modification is carried out by a company holding a valid mass-conversion decision (HP), it complies with the regulations and doesn't change the vehicle's roadworthiness status.
Who can legally perform chiptuning
A company authorized to carry out the relevant mass conversion may register the change in the vehicle's documents and fit the vehicle with a plate stating the approved engine modification. Based on this registration, the relevant authority can update the vehicle's records.
Current holders of a mass-conversion decision for engine power/torque include, among others:
| Company | Company ID | Conversion No. |
|---|---|---|
| Hošek Motor a.s. | 63484463 | HP-0287 |
| Legální Chiptuning s.r.o. | 05235634 | HP-0288 |
| PowerTEC - značkový chiptuning s.r.o. | 01533461 | HP-0285 |
| XTUNING LTD. - branch | 03933687 | HP-0296 |
| Volvo Car Czech Republic s.r.o. | 63981726 | HP-0163 |
| M Motors CZ, s.r.o. | 27192636 | HP-0200 |
| Profichip s.r.o. | 28354699 | HP-0436 |
What's illegal
Any other engine modification not carried out with the manufacturer's consent, by a mass-conversion decision holder, or registered with the relevant authority, counts as an unapproved change to the vehicle's type approval — resulting in loss of roadworthiness status.
- Legal basis
- Act No. 56/2001 Coll., on the conditions of vehicle operation on roads
- Decree No. 341/2014 Coll.
- Ministry of Transport decision on mass conversion (HP)
- Required paperwork
- The change carried out by a company holding a valid mass-conversion decision (HP registration number)
- The change recorded in the vehicle documents by that company
- A plate on the vehicle stating the approved engine modification
- Authority
- ORP transport department (based on the registration made by the authorized company)
- Inspection/verification
- STK