That's the worst reason I've ever heard for a total rig like that.
That's stupid, to put a $50 muffler in place of a $10 piece of pipe.
BUT: It's his money, He can do whatever the fuck he wants.
You lose all the maybe 15hp advantage to doing a dual exhaust, but WTF, it' s "Merica!!!"
I ceased expecting smart people years ago.
"I'm old school, and I want true dual exhaust"; is ridiculous, as "Scavenging" was a thing in the 30's.
Dumbass has no age limits.
There's no excuse for not understanding flow these days, unless you don't trust the internet, lol. Or books, those go even further back.
The mandrel bent systems I bought fit perfectly; again, Dumbass. 2 cars so far, two sizes. WTF.
This isn't exactly a hidden forum, and theexhaust mods show up as the first thing on google.
EDIT: I missed the "HOT air intake" Dumbass #3.
I bet that runs GREAT!
He dropped at least 20 hp; and since you didn't say 'tune', there's DA#4.
I'd blame the education system, if he weren't older than my dead mom.
You should be helping him, not telling us how bad he's fucking up.
Yes, I am an asshole; you could have avoided that by not mentioning the age, as if that helps; YOU should know better.
Yes, he's happy got what he want's, but everyone who talks to him, or reads this will know better.