Darius Rybak has not sent me pictures of his own car yet, but the list of modifications is available here. The car is a Punto Sporting Mk1. When Dariusz bought the car as used, it listed these modifications:

• tuned cams head
• NGK Vline spark plugs
• cat removed
• Rear sport exhaust system
• Kingdragon air filter
• lowered AP (blue) springs
• Punto GT Shocks

Those mods gave 90HP with 116Nm. About a month ago Dariusz talked with one of famous mechanical tuning specialist in Poland (www.chojnacki.com.pl). He put his own cam head which was made with A-group specification (from original cams). That gave a max power of 95HP at 6000rpm and a max torque of 126Nm/4950Nm. This performance test was done with paper air filter because Kingdragon filter lowered power for 1HP!
Now I own the original Fiat central and rear silencer, but I didn't feel any power loss. I'm going in few days to check my performance again. The only thing I checked is acceleration: my car performs quite well, 9.52s in 0-100 kmh.