Ultra Racing, in Malaysia. Their kits can be cheaply bought on eBay.
They do make a kit of tubular frames to surround the floorpan in Mk 4 series cars. 2 strut bars + 1 frame around the front subframe + 2 frames beneath floor + 1 frame around rear axle mounting points.
Not all of them fit all cars: some bars made for TT Mk 1 do not fit the Leon, other made for Golf Mk 4 do not fit the TT.
It's like a poor man's version of an autocross roll cage.
They do make a kit of tubular frames to surround the floorpan in Mk 4 series cars. 2 strut bars + 1 frame around the front subframe + 2 frames beneath floor + 1 frame around rear axle mounting points.
Not all of them fit all cars: some bars made for TT Mk 1 do not fit the Leon, other made for Golf Mk 4 do not fit the TT.
It's like a poor man's version of an autocross roll cage.