will nismo exhaust fit ka24de? HELP!

[Mikester]

^^agree to disagree.

A 1", 2" or 2.5" , 4" or any other exhaust will be louder on a KA than an SR too. So how exactly does the piping diameter make a difference? I promise you, my exhaust is 3" and fairly quiet... and it will outflow a loud-ass 2.5" fart can with less resonating/muffling all day long. There is a difference between engine design that comes into play there- apples & oranges.

Now, if you are saying that 2 identical exhausts... one @ 2.5" & one @ 3" with the exact same resonating/muffling system are put side by side; the 3" will actually be quieter... the one with the bigger piping will theoretically be louder because it flows better; but that isn't the case.

MagnaFlow Performance Exhaust - FAQ, Frequently Asked Questions

Increasing the diameter of the piping actually decreases the velocity of the exhaust flow because the engine isn't working as hard to push it out due to less back pressure. End result will be a quieter, deeper tone all things being equal.