Let's talk unequal length (UEL) header! Options

[Syaoran]

I've been wondering what does it exactly consist of to make unequal length headers (in our case, header) for a straight-four. I know subies come with these stock due to design.

I like how unequal length headers sound on any car, be it 4,6,8 cyl engines... it's just not tinny and tends to resonate less. It's a sweeter, cleaner sound. So I'm all UEL Header just for the sound.

I know there is a certain science behind it, but what exactly would it involve to have this done in our celicas?

[celica74]

Alot of detail there. I noticed on most ebay headers for the 74 the cyl. One running has a curve in it assuming it is longer then the other three. Id assume just making 1 and 4 a certin way and then making 2 and 3 have a slight curve outward to compensate would do the trick. I doubt youd be able to tell an audiable difference though. Still have the cat( if you havent taken it off), resonator(if you have one), and muffer(if you arent dumb like me and cut it off) to go through.