The section of tubing between the catalytic converter(s) and the rear muffler on cars that have two parallel exhaust pipes. Performance mid-pipes often have a perpendicular connecting pipe or the pipes temporarily merge. This is to equalize the pressure in both exhaust pipes.
H-Style Pipe where there is a perpendicular connecting pipe, resembling the letter H
X-Style Pipe or X-Pipe where the exhaust pipes temporarily merge, resembling the letter X
Images are for representation purpose only. Actual product may vary.