V-band clamps are used to secure various components of the exhaust and turbo system, such as v band clamp housings, downpipes, and intercooler piping. These clamps provide a strong and reliable connection that can withstand high temperatures and pressures. V-band clamps are preferred in performance applications for their ease of installation and removal, as well as their ability to provide a leak-free seal. They are crucial for maintaining the integrity of the turbo and exhaust systems.