Flowmaster has taken the laminar core of our classic HP-2 muffler and wrapped it in a new compact square case. The new Super HP-2 Series muffler offers the same great performance benefits and moderate tone that you would expect from our laminar flow mufflers, now in a new sleek styling. These mufflers are available in either a 409S stainless steel case or a polishable 304S stainless steel case and in sizes ranging from 2.00 in., 2.25 in. and 2.50 in. These mufflers are manufactured in the USA and are covered by Flowmaster's Lifetime Limited Warranty.? Stainless Steel Construction? Dyno Tuned For Maximum Performance? Patented Laminar Flow Technology? Lifetime Limited Warranty? Made in the USA**The 2 size is only available in the T409 Stainless Finish.