Most people will buy these just because they look so nice! A lot of work and testing went into making these. Engine builders that dynoed them said they made more power everywhere in the 305 rpm range. The power hangs on over time with stainless, unlike steel, which loses power over time. The stainless headers are stronger and don't dent in as easy as steel. With 305's having limited horsepower and being so even, every gain is very important. Get them before your competitors do.
1-5/8" to 1-3/4" Stepped Header with 3" Collector