MBRP 4″ Downpipe Back Exhaust – Stainless GM 2001-2007

Engineered to minimize air restriction and flows 29.10% better than stock. Fully enclosed airbox protects filter from dirt and engine heat. Secondary inlet for improved airflow. Properly mapped MAF sensor to avoid check engine lights. One-piece airbox with integrated seal for cooler, denser air and better performance. Available with 8-layer Cotton Cleanable (oiled) filter.