Back pipes are direct-fit exhaust components connecting the muffler to the tailpipe, typically utilized in rear-wheel-drive and some all-wheel-drive vehicle configurations. These mandrel-bent tubes maintain consistent inner diameter for optimized exhaust flow and minimal backpressure. Construction is commonly aluminized steel or stainless steel for corrosion resistance and durability. Flanges or direct slip-fit connections ensure secure installation and sealing. Back pipes are vehicle-specific to maintain proper exhaust system alignment and noise regulations.