The Supersprint V1 SPipe was designed to continue the larger diameter of the Supersprint V1 Stepped Headers. These are one of the highest flowing pieces for the E46 M3 that has no compromise in power and torque. It uses a 63.5mm diameter that slips on the headers. It is compatible with any OE-style section 2.
Best when used with Supersprint V1 Stepped Headers (044001). This deletes the catalytic convertors and is for off-road use only.