Hi. This is my first post, ever, anywhere.

I have a stock 1994 Integra GSR and I want to know what diameter tubing I should order if I wanted to make my own header-back exhaust. As in, i'll buy a header (any recomendations?), a catylitic converter (also, any recomendations?), and probably a stock muffler from a larger displacement honda (is this a good idea?). Buy tubing from McMaster-Carr and weld it up. Has anyone any recommendations towards this goal. I'm not really looking for massive power gains, no loss and no holes in the joints would be great, but I'd like to try. Thanks.

Adam

 

2-2.5" and don't run straight pipes, make sure you have the cat, resonator, and muffler installed in it also

 

is the resonator really neccessary

 

not entirely, but back pressure is, the resonator is just another assembly to add that pressure IMO, it serves another purpose but that's all i see it as

 

I probably would not add a resonator for the sake of simplicity, as far as I know there just a perforated tube, and since I'd like to use a OEM honda muffler I will speculate that one would not be nessisary. I want minimal volume however, so if a muffler alone is somewhat loud then maybe I'll add one, but I want to keep it simple. Does anyone know of a good combination of parts to use with 2 - 2.5" tubing, ie, header, cat, muffler, et.al.

Thanks.
Adam

 

99% of JDM cat back systems for n/a cars are 2.38" in diameter (60.5mm) which i think is a pretty universal size pipe, so thats what i would go for if making up a custom system.

 

Resonators add no back pressure. Its just a tube in a bigger tube with holes. It cancels out sounds through reflection cancelation. You refelct sound waves back, and they cancel out the followign waves. Use one. No losses from back pressure, and lower sound output.

Your header choice depends entirely on what else you have done to the motor, where you want the power band, etc...

All stock honda mufflers will cause backpressure, because they are all chambered. (Someone correct me if I'm wrong here, S2000, NSX, or other higher performance car might have a different design.) If you want performance, then don't use a stock muffler.

So, without more information, I would just say to get a complete hytech system. Nice header, a high flow cat, and a straight through muffler.

 

try this website:

http://www.kteller.com

he's the man, and he really knows his stuff...

however, if you're hell bent on doing it yourself, and going to a muffler shop to get a crush bent system, go for it. just remember, whatever header you get should help you determine the diameter of piping to get. most aftermarket systems are 60 mm to 60.5mm. check out http://www.team-integra.net/se...D=451

every stock honda muffler is chambered. the itr provides more flow (supposedly 30% over gs-r), but it's still chambered.

a resonator does NOT add back pressure. where the hell did you hear that? like tunern00b said, it just cancels out sound waves, and thus quiets up the system.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by obd2gsr &raquo;</TD></TR><TR><TD CLASS="quote">
a resonator does NOT add back pressure. where the hell did you hear that? like tunern00b said, it just cancels out sound waves, and thus quiets up the system. </TD></TR></TABLE>

i'm only right 98% of the time my apologies

 

As for the exhaust header.... I have done nothing with the motor, and outside of perhaps an intake its condition will remain stock. With that in mind, I guess the rev range that is most important to me is the 4K-7K. Eight thou is nice, but its there only for "emergencies". Of course build quality is also very important to me, and I expect that does not come cheap. So,which manufacturers provide these qualities?

For the muffler, I guess my theroy is stick with OEM, but take from a larger displacement engine... if it was designed for a V6 Accord (the '95 model has a single muffler) then a great deal more air was ment to pass thru then a 1.8L would otherwise provide, ergo, less restriction for the smaller engine. If my reasoning is specious feel free to enlighten. So the chambered/straight thru debate isn't applicable.

Oh, and thanks for the links, keep 'em comin'!

Adam