Hi
In Belgium, there is no possibility to swap cars, engineering controls are not tolerant
Nevertheless, changes through the ecu
First, the additional power box, very popular, inexpensive and easy to install for 15hp more.
Second, the reprog, some tuners are talking about a gain of 25HP
Personally, I have a power box and 160000km (100000 miles) no worries
Soon, decat, bigger turbo, intercooler, changes in intake (exit the air filter above the motor)additional power and a box of my making