I really do t think many aftermarket exhausts flow better than stock enough to see any proveable improvement. The factory flows pretty good but is muffled down for sound requirements. The main benefit is sound.
asfor intakes, a better breathing intake will “help” mildly for performance builds. But my question is, if you put all the aftermarket intakes, side by side, the aftermarkets will most certainly flow better.
BUT do they flow cleaner?? I doubt it.
at Best, as far as mods I feel are worth it,
Sound exhaust of your choosing. (I run corsa extreme)
Leveling kit with UCA’s
Ram-air intake (factory quality filter)
High quality baffled oil catch can
And a custom horn from boomblasters. mine has the screaming goat meme sound so I can scare the hell out of people I drive by.