hi all
i had a set of headers made up by my local exhaust shop for my civic with the d16y4 in it, after the headers got it run on a dyno for next to nothin to see what had improved, extra 8 kw atw, not much but alot better response and the angrier engine note was great. i would of done it just for the sound, the lil SOHC 1.6 sounds pretty dam good with a decent zorst and intake on it
my 2 cents