the best route is the ultra flo's,they are t-304 stainless steel w/stainless steel & fiberglass packing & feature "see through" design for maximum flow,but the best thing is the $$ and the lifetime warranty (they even come polished w/the cool "ultraflo" logo stamped on the side)they are highest flowing & most "bang for the buck" muffler on the market.for the best price in the country on these mufflers contact summit racing in akron ohio 1 800 230 3030,the part # for the mark8 2 1/2 inch applications is 17263, the total shipped to your door is $200.86.