What size is our stock exhaust (in inches)? No one can seem to give me a straight answer. Some say 2"...some say 2.25"...some even claim 2.5"!

 

I was always sure that its 2.25".

 

Ok, thanks. BlueC has convinced me to stick with 2.25" piping for my custom b-pipe to keep things from getting too loud once I get my y-pipe. It'll also make it easier for the guys at the shop since I have a 2k2 muffler and it's 2.25", too.

 

do u mean by piping? outlet...can u be more specific?...

i'm pretty sure the piping is 2' all around....i might be wrong..or i might be right not sure...but to make it easier i recommend jus measuring it yourself..i would do it for you but im not at home..heheh

 

Well the stock exhaust should be the same diameter the whole way back. So I'm not sure what else I need to be more specific about

 

2 FEET, Joman? surely you meant 2 inches?? jj
but i believe it is 2.25" all the way back, not accounting for crush bends, of course.

 

Alright, sounds good. I'm going with mandrel-bent 2.25". Hopefully the high-flow resonator and less restrictive bends will allow it to sound nice without making it real loud.

 

wtf why? might as well upgrade the 2.5 piping with the bpipe, i mean youll get a little more gains, and the car will breathe properly. if you get a 18inch resonator your fine

yea the stock piping is 2.25 i believe, 2 inches come with most 4cylinders stock

 

many people running high HP cars have 2.25 piping....
Depends on what his plans for the car are...
If he's wanting to go with a few mods, and have a quiet car, then 2.25" piping would work better for him....
But I would go with 2.5", big resonator, and a nice muffler either way....

 

gotta be so critical hahahaa u know what i mean...smartass...LOL

 

Uhhh...I'm not planning on going FI. I don't need anything bigger. blackmaxx96 has it right. I don't necessarily want a "quiet" car, I just don't want an obnoxiously loud car. 2.5" y-pipe + eliminating the crush bends and using a high-flow resonator on the b-pipe will be pretty decently loud for me. I also have a 2k2 muffler, though.

 

With the 2k2 muffler I doubt you'de hear any sound anyways. I don't think the piping will make a difference. The resonator would though.

 

Piping makes a big diffference.

Mike

 

I thought high powered cars running turbos etc have 3 inch piping to get flow out of there as quickly as possible

 

the point is to have high velocity exhaust... the bigger you go with piping the more turbulance you cause in the pipe itself... and that actually slows it down...

 

I know that, I just thought the high powered cars produce a lot more flow from all the added power that way it can get out quicker from the bigger piping but still have a good velocity. I was misinformed then I guess

 

where'd you get this from? bigger pipings don't cause more turbulence. it's the obstructions like bends, and o2 sensors that cause turbulence. bigger pipings actually help the flow to be more laminar than turbulent given the fixed exhaust flow velocity.

turbulence is caused by an object for structure that sits perpendicular to the direction of the flow. the obstruction causes swirls that the flow goes around it to "dodge" the obstructions. increasing the piping size will help "damp out" the effect of the obstruction allowing a more stable and laminar flow: less turbulent.

 

That's pretty much what I was told. BlueC tells me he feels like he lost low-end with 2.5" piping, so he reccomended I stick with mandrel-bent 2.25". The high-flow resonator should make things sound a little throatier though.

The y-pipe will add all the loudness I need...

 

well my is not done yet but my mechanic told me the my pipe were around 2.25" and theres no need on getting any size bigger and these guys they know wat they are talking about he told me just get a better silencer and would do the trick...they also had build my old 88civic with the integra eng way before people knew wat a integra eng swap was.. low 13's back on 99
any ways. me im just getting a magnaflow or something like that ... somebody else can said yeah buy it and we put in.. but he said i will loose some low end power so im sticking to my stock and just upgrade my silencer

 

2.25" but not sure if that's ID(inner diameter) or OD(outer diameter)

 

inner diameter.

 

So, this one should be alright? I just want to go with the Borla....
http://cgi.ebay.com/ebaymotors/Borla...QQcmdZViewItem

 

i do believe it is 2.25".........and 2.5" piping with no resonator and a apexi muffler is pretty quiet still....i jsut wish i still had it .......now 2.5" piping with 18" res.....and 3" inlet/oulet Ravin Muffler is loud(wish i didnt have it)

 

Ill sell you my full Cattman exhaust i love it but im un modding the max because I got an 04 M3

 

I don't think he's interested in buying aftermarket..Just curious to know stock size.

I've even heard of 1-7/8" .. I still have my stock y-pipe, if it's any indication, I can check it this afternoon, with pics.

 

Stock y pipe - 2.25"

stock cat - 2.5"

Stock b pipe - 2.25"

Stock muffler outlet - 2"

 

My car when I bought it, has 2.5" piping without a resonator and a Apexi WS knock-off muffler. It sounded really nice, then I put the ypipe on it and its really loud. At cruise around 60, you can't hear it, but if I put my foot back into it, the whole cabin fills up with noise.

Here in the winter I will be purchasing a huge resonator and a 3.5 Altima muffler.

 

How much do you want?

 

Stop thread hijacking, take it to PM


So, with all these #'s thrown around from different memebers, is there any proof/truth to any of them?

 

I dont get why you would want to get 2.25 piping. Not to take anything away from BlueC, but theres tons of people on here myself included that didnt experience any low end loss with a b-pipe. Besides, the gains from a b-pipe are barely noticable with 2.5, and I would think 2.25 piping and just removing the crush bends is just going to feel like stock. And dont be worried about the sound as long as you are keeping a stock muffler.

 

Haha, I was thinking the same thing. I was just learning this stuff in one of My chem E classes.

 

1.73" for the y-pipe outlet before the cat.

 

I went out and measured my old exhaust sitting in my garage

 

So did I...

 

Too late now, I already have a 2.25" inlet/outlet resonator in my posession. It's being installed tonight with the new piping, as a matter of fact. Besides, if the gains are barely noticable with 2.5" piping...what difference does it make if I get 2.25" piping if I'm not gonna feel it anyway?

 

Update us when you get it back.

 

2.5" piping is done as an early investment if you are going to heavily mod your car, N/A. if you are stopping right there, then 2.25 or 2.5, like you said, won't make a noticeable difference. but if you are going all the way, doing all N/A mods, 2.5 all the way is what you will need. since 2.5 or 2.25 doesn't make such a difference now, think of the long run, you may need it. because it's always a btch that you upgrade more and having to upgrade that pipe again. just an investment suggestion. if you are not going too far with modding, then 2.25" piping isn't going to be your concern at all.

 

Well, the work was done tonight. Went with 2.25" piping since that's all they had. It sounds GOOD. Perfect tone, and not too loud.

The stock piping was 2", by the way. Or atleast the small section from the cat to the stock resonator was.

 

glad you are liking it. what's next???

 

I hope a y-pipe, if it's not already on.