Stock Exhaust

[Nis240sanSX]

What is the diameter of the stock piping on an s13 from the cat-back? I've been looking, but I can't find it anywhere.

[QUICKFLOW240]

1 7/8"

[Nis240sanSX]

thanks, is it the same from the header to the cat?

[Zebrahead]

thanks, is it the same from the header to the cat?

I don't think so, someone told me that the "downpipe" I guess you could call it from the header to the cat is usually larger than the stock piping. Someone told me its usually around 3".

Don't quote me, but I looked under my car the other day trying to find what bolt was loose on my new exhaust, and the "downpipe" is pretty large.

Nick.

[s14=pimpin']

hey nis,

do you have the SOHC or DOHC motor? I know on my DOHC S14 the stock piping is 2.25", can't see why it would be different on the s13 DOHC motor, considering they are the same motor/transmission combo. I could be mistaken for your s13, but I am sure its 2.25" on the s14

hope I didn't confuse y'all

[Nis240sanSX]

I have a `93 DOHC, so I'm pretty sure it should be the same as the s14 right? 2.25"

[s14=pimpin']

I have a `93 DOHC, so I'm pretty sure it should be the same as the s14 right? 2.25"

Makes sense to me, but I would either run a search, check other forums or ask around. Sorry, but I don't know much about the s13, but we have the exact same engine and transmission (pretty much) and our HP is the same, so I figure piping is the same. Why do you want to know, upgrading? If so, go for 2.5" piping for a N/A application, if you are turbo, you'll want something wider. I didn't want to be too loud, so I kept the stock width, 2.25" and the resonator muffler. Got minimal gains with a free flow muffler and intake, and I think I may have actually lost low end torque. Either that, or my clutch is slipping real bad!

hope that helps a little