Every system is dyno-tested for maximum performance CAD-rendered, two-piece 4-2-1 design eases installation CNC-machined O-Rings eliminate leaks 100% 304 Stainless steel construction including the flanges (polished or brushed), or mild steel with ceramic coating CNC mandrel bends with robotically-welded fittings deliver perfect fit CNC-machined and threaded flanges eliminate leaks Equal length primary piping ensures optimum tuning of systems for more power across rpm range C.A.R.B. exempt or pending C.A.R.B. exemption Includes comprehensive instructions and all necessary hardware