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In the way back...
Engines were severely choked by the intake and exhausts the OEM's put on them.
A different air cleaner and headers could free up some noticeable horsepower.
That's not as true as it used to be.
Getting more efficient means the intakes and exhaust flow very well now.
They will handle anything the stock motor can put out and putting on better stuff doesn't actually free anything up.
If you're adding a lot of power, of course, you will need more flow capacity, but you're just not going to see the boost that doing it used to do.
Headers perked up the 305 in my '79 Camaro noticeably. A whole second in the 1/4 mile. A 4-barrel woke up it even further. But it was just a 305...
A bigger motor with 45 more cubes did MUCH more.
But I've watched people with much newer cars put serious money into exhausts and intakes and seen the before and after dyno runs. 10 horsepower, tops. The good news is they have the flow capacity to double the output, but rarely do they even put a new cam in...
The only reason I'm looking at exhaust for The Beast is acoustically cosmetic. I don't want the Cadillac quiet exhaust on my hot-rod. The police might need silence to creep up on a suspect. I don't.
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