which of these two mufflers would be better for max HP, and have a more aggresive sound. louder the better. motor is a 355 chevy built more for hp than torque. around 400 hp and 380 ft-lbs torque. im leaning towards the dynomax, i've never heard them but they sound like they'd be badass. i've heard a single 3" magnaflow w/ cat that sounded good, but a little tame for this truck. maybe duals w/o cats would be better. Or, if you have a better option for around $150 a pair chime in. I've got a Flowmaster 40 series on my blazer and i want to try something different. Heres the links to the mufflers Dynomax: #289-17218 http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=1363&prmenbr=361 Magnaflow: #642-11216 http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=85512&prmenbr=361 .