This is a three inch bolt-on system for the Mk3 platform, made of almunized steel. This kit fits the same as an OEM exhaust system. This kit attaches directly to the factory downpipe and runs all the way to the rear bumper. Includes a stainless steel muffler. For more options (such as adding O2 bungs or using V-band flanges), please call 410-360-7105 or e-mail firstname.lastname@example.org.