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I keep hearing everyone here say that 2.25" is the best diameter exhaust for our cars. I'm curious how you all came up with that, but I'll believe it for now.

Ok, now my real question is this: What does that mean? Which parts should be 2.25"? Everything from the header back? From the cat back? Just the exhaust? Just the exhaust opening? And for those parts that should be 2.25", what are their stock measurements?

Now for my other exhaust questions:

1. Why the hell are exhausts so expensive? It's just a piece of metal, right? People are paying like $500 for them! Unless metal is a lot more expensive that I thought it was, something is going on here [IMG]i/expressions/face-icon-small-confused.gif[/IMG].

2. On the new eclipses, what size is their exhaust opening? Would that type of exhaust fit on our cars? I think it looks good.

3. What are the types of exhausts you can get? So far I've seen/heard of only three styles.
[*]Just the muffler. I can't see how this would give much gains
[*]A catback. From the cat. back.
[*]The full thing From the header(?) to the very end.

Is that list right? Wrong? What did I leave out? What are the advantages to each one?

That's about it for now.

I hope I get replies. If not I might have to come back and ask "which exhaust will make my car the loudest?" I have a feeling that question would get a ton of replies.

Thanks,

IronFist

 
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hey ppl.......any suggestion on which one i can for my car?

 
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Here are some answers. I am not sure if they are all correct but they should help you.

1) I am not sure why it is expensive. To be honest you can get it cheaper, but I think it has to do with the quality of pipe you use.

2) Most people just get 2.25" or 2.5" from the cat to the muffler. They are like me and dont want to spend $600 on a DC Sports or GReddy.

3) I am not sure what the stock measurements are. Probably not too much smaller.

4) I am not sure what size eclispe openings are. But I have heard their exhausts are not to great anyway

5) You can get a catback ( piping, resonator, and muffler) , an axle-back (piping from the axle-back and a muffler) , just a muffler, or you could get an exhaust with a high-flow cat. I havent heard anyone selling exhausts for our cars with the header included. Maybe DC Sports.

6) You arent gonna get much HP from any of these options but your best bet is to get new headers, high-flow cat, and new exhaust.

Joel

PS - Not sure if all that is correct so anyone correct me if I am wrong.

 
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wouldnt it be pointless to get 2.25" pipping from the cat to the muffler, then choke it out at the mufler with smaller pipping? doesnt that defeat the purpse of the wider pipping?

 
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Yes

 
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Manufacturers have costs involved in designing and making systems for new cars. They must recover these costs and that's part of the price. Then some copy cats can come along and make a cheaper system. Another factor is the use of stainless steel, which costs more to buy and is more expensive to work with and to weld up. Then, of course some brands demand a little more price, just for the name.

Remember when the AEM intakes first came out, the list price was around $250? Now you can buy them for less than $100 maybe. Prices usually come down when there is some competition in the market.

It all boils down to quality of materials, design and fit, and maybe some brand name recognition.

 
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The diameter is dictated by horsepower, which in turn dictates exhaust flow. More HP, more flow. My '69 uses dual 3" exhaust and is still a bit restricted at full squeeze. The honda couldn't use the additional flow capacity of the 3" (or 2.5") exhaust. 2.25" is about right for the hp we generate with our mods. It is also easier to fit a 2.25" exhaust under our cars. 2.5" starts getting cramped at the bends.

 
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2.25" piping means that the diamater of the exhaust piping before it was put on the car (in the case of custom jobs) was 2.25". I say before, because most shops create the bends in the pipe by crushing it. On my particular custom setup, the piping after the cat was 2.25" in diamater, there is no resonator, and has a universal muffler that has a 2.5" inlet and a 4" tip. Most custom setups are like this. The prebuilt cat-backs are made differently, and are not usually exactlly 2.25". They measure the pipes in milimeters in Japan (metric system!!!) and they usually come out to close to 2.25" for non-turbo applications. As far as the stock measurements go, I think the piping is 1.75". I might be wrong on that though. Also, the stock muffler is designed differently that most aftermarket mufflers. Go to a shop and look at some of them, they have a straight through design, the exhaust gasses flow right out. Compare this to most stock mufflers that have offset inlets and outlets, and the gas is dumped into the chamber and it eventually finds its way out (...maybe thats a bit off an exaggeration).

Bartkat had a good answer.


No clue as far as sclipses go...ask an owner of one. What do you mean by exhaust openign? And when you say "type of exhaust" do you mean would thier exhaust system from the factory bolt onto our cars? If that is your question the answer is no.

Your pretty much right about that

Depends on what you want....if you want looks/loud sound save the money and get a custom job. You get to choose from a HUGE selection of universal mufflers. Want performance/not so annoying sound? Get one of the name brand, pre built cat backs.