GMC Sonoma: Snow Fun Offroad

Description from youtube:"This is my 2002 GMC Sonoma ZR2 when I bought it. I wondered how well it worked in the snow.
It gradually lost power since two years I have it. I didn't really notice that lost of power. And it gave me a DTC trouble code :P0101 Mass air flow. So i modified it by removing all the catalytic stuff, I put a Glasspack instead of the muffler and I put a O2 sensor simulator on the bank 1 sensor 2. Now it got a lot of power and sounds great!"