hi
how are you?
I have run this muffler for 40 years on my 400 pontiac with hooker super comp headers..2.5" in and 2.5" out:
https://www.amazon.ca/dp/B00029J3C0/...v_ov_lig_dp_it
I can tell you, all my friends have the flowmaster 40 .....line of flowmaster 40's....some have flowmaster 44, some have flowmaster 40 series.... Their 40 line is quite the naming convention.
i have looked into it extensively....dynomax vs flow master.
So the super turbo above is considered the quiet end of dyno max... Ummm i would say no...... my gto sounds just like if not as close to the flow master 40's.... it is mean... the dyno max super turbo's are about $30 less per muffler .... I have never had a drone problem... And I have 390 gears...........run 3000 rpm just to get speed limit on highway......... however choose them for my car when it was built, was a good choice...
it's good for up to 350 hp - 400 hp... so that pretty well covers most builds.. if you call dyno max and say i want one better muffler, their next muffler up is ultra flo 17219.. again offset on one side and center on other, both 2.5"
only $30 each more... So.... step up one or buy flowmaster.....
again dual exhaust setup... pm if you want sound videos from my car.