Mercedes Benz W177 AMG A35 FI Exhaust Catless Downpipe Mercedes Benz W177 AMG A35 FI Exhaust Catless Downpipe IPE Catback exhaust Mercedes A35 W177 Mercedes Benz W177 AMG A45s FI Exhaust Catless Downpipe and Valvetronic Mercedes Benz W177 AMG A35 FI Exhaust Catless Downpipe. The IPE Catback exhaust for the Mercedes A35 W177. The exhaust is the perfect upgrade, the 4 cilinder engine refined with an iPE Innotech Performance Exhaust system produces an extremely loud and aggressive sound as well as a comfortably quiet cruise by the push of a button. The unique design overcomes the limits set by the stock exhaust, so that performance, sound, and driving pleasure can be increased dramatically. Opening the valves will let you experience the much deeper and more aggressive IPE Sound, while closing the valves still makes your Mercedes A35 W177 suitable for everyday use.