I just went out and did the "magnet test" on my Gibson stainless steel exhaust system I installed 11/01/01. The muffler itself passed, but the headpipe (#482-700367S) and the tailpipe (#483-700368S) failed! It even states on the list of parts that BOTH the pipes are stainless steel (S/S), I feel had! On Tuesday, I'm going to call the customer service number 1-800-528-3044 and see what's going on here. The only thing I can think of is that the pipes might be made of a different grade of stainless steel than the muffler.