Review on TOTALFLOW 47-304-201-15 Universal Straight Exhaust Pipe Extension - Tube Replacement 304SS Straight Tube 2 Inch Outer Diameter - 47" Long Exhaust Pipe by John Gray

There are a lot of negative reviews for this product, however I made my second order of this for practicing tig welding. I do know though that 304 stainless steel is not magnetic, 409 stainless is magnetic. 409 has great corrosion properties granted it is welded with the correct filler and gas, the pipe will oxidize and slightly rust over time on the surface whereas 304 will not. The other reviews make me uncertain, but I’m happy with their piping. Inside is clean and not full of oil and metal shards like Mandrel mild steel I got off eBay.