You’d have better luck eating a duck and shitting out a pillow, there are two v6’s in existence that sound “cool” one is the Alfa Romeo “Busso” and the other is the Nissan GTR. You can maybe and this is a big maybe, go buy a cheap welding rig at harbor freight and some 2” round stock in a big mess of pre-formed angles and lengths. Assuming that turd of a GM boat anchor has cast pot metal manifolds housing a cat in each. You can get a pair of flanges fabricated and start tacking snakes toward some collectors and if you cross over header tubes from bank one into bank twos collector and same from two over into one so that the firing order becomes sequential and alternating evenly across banks rather than the typical cross plane crank characteristics of power strokes happening on bank one then bank two twice then bank one twice then bank two once and bank one again, you’ll have if but only in exhaust pulses, a flat plane crank firing sequence alternating banks with each power stoke sounding like a Japanese four cylinder street bike in comparison to the sick, leaking, ticking, heavy as your girlfriend, opossum shit covered, soggy little dog dick of an engine you have under the hood of that sanctimonious abomination of mobility! FUCKING CUNT! Ditch the cats duh weld in some snorkel bungs for the down stream o2 sensor(s) leave the upstream where they were or close enough, merge into x pipe then split against each into short glass packed resonators finally meeting up to some kind of muffler that’s not obnoxious , the novelty of a “race/chambered” muffler vanishes after 6-7 minutes of consistent speed cruising on the freeway as your eye balls vibrate and your tiny testicles become homogenized , molecularly uniform and functionless, as they’ve always been just now they’re like what you’d expect if you sliced a lacrosse ball squarely along its equator… no identifiable deviation in composition, firm, incompressible, and without utility. Welcome to fuckboy fart can exhaust reversion resulting from unmitigated collision of pressure waves neglected to be deflected elsewhere than from where they originated… AKA exhaust drone …aka “I know nothing about my car but I’m pretending so much that I’ve convinced myself but my girlfriend knows I’m a tool and so does her dad and definitely the older dude she’s fucking behind your back knows and he also wakes up with a dick harder than you’ll ever work in your life so get used To being a cuck.” I forget the acronym but that’s a long one … but wait you’ll never do any of this and I just laid all this wisdom on your unappreciative tiny balls for free and I could have summed it all up like this …. “You can do whatever you want to that car , fuck put a fighter jet engine, some wings, and hang some hellfire missiles out the window…. But at the end of the day, it’s still a PONTIAC FUCKING GEEE SIXXXX!!!!!” Just sell it and buy something cool … like a short stool and a long rope. (Takes a bow)