So what exactly is wrong with the Stillen SC kit?

Originally Posted by esfourteen

one of the biggest concerns with the stillen kit is the placement of the MAF. the primary MAF also functions as the intake air temp sensor. the ecu uses IAT's (along with a few other sensors) to adjust timing on the fly, hotter air and the car pulls timing. with every other forced induction kit, the MAF's are placed after the intercooler, which means the ecu gets a true IAT reading and can adjust accordingly. with the stillen kit, the ecu is basically reading ambient air temp as IAT since the maf's are in the bumper before the blower. so during hot summer months when the heat exchanger gets heat soaked and the intake temps are increasing, your ecu is still reading whatever the temp is in the bumper, not the true temp of the air entering the engine.