i have had t5's, fatties, gnarleys, bills, pt mids, dmc aliens, and i now have dmc 916's. i would say the t5's and dmc 916's are the best pipe i have had for the type of riding i do, and the 916's are by far the best "sounding" pipe available in my opinion but you cannot base decision on sound. if you are looking for mainly low end power then i would steer you towards the paul turners ot the gnarleys. i got my dmc's fom www.worldwideperformance.com