Silverback,,
DV 1 had EPA sidepipes when it was first built--three laps around the Run N Gun track in St. Louis and it, the exhaust blew out both catalytic convertors until they were "hollow"!
When we got her home that is when I took the Pipes off and built the custom flow through sidepipes- gained about 17 HP, but no deep BB rumble one would expect. Deeper than a normal Viper and nicer but Nope, still didn't sound like a BB.
I always said it sounded like a John Deere tractor on Steroids
Or a million pee'd off Bumble Bees!
(Fastest time in the 1/4 (Chrysler Nationals) 11.00 @133mph) NHRA Officials told me; DV one more tenth and you are out of here!
DV