ECU or something and we shoved 2 blue shop paper towels into the MAF opening so no birds or critters decided to nest. A few weeks later, we put the MAF back on and I decided to drive back to his house. Car ran like crap and when I hit boost, it would only go to like 4psi then choke. Did this a couple more times and it finally sputtered and I got all my boost back. Obviously later realizing that I had left the 2 shop towels in, we later took off the bumper and both intercoolers to find that the PS intercooler was full of confetti sized pieces of blue papertowel.