Please check out https://honda-tech.com/zerothread?id=168093

If any of you guys are interested I could possibly add some Prelude stuff tot he order. But let me stress, this IS NOT a cat back system, it would only be the tubing and then the resonator(s) and muffler would be added.

 

What about 3". You could really blow the market open with it. Nobody mass produces a 3" for the Prelude and their is a demand!

 

so the resonator and muffler is not included with this? how much would the complete cat back cost?

 

no one makes a 2.5" either

 

This would be a tubing kit not a bolt on system. You could then get your own 2-1/2" resonators or mufflers as you like or purchase them from me and then have a shop install the system. But the install should be fairly easy since the tubing will already be bent.

 

That's not true. I have a Brullen 2.5" cat-back with straight through resonator, 304 stainless. They have different tips and cannisters available. I chose a dual 3" resonated tip to try and look as much like stock as possible. They have 3" piping available as well as the 2.5".

Right now I'm running it NA since I'm breaking in the engine before I can put the turbo back on.

This is a short clip of it NA with stock header. I can't do a WOT run, because like I said, the engine is still breaking in. The tip is also real dirty from driving on some dirt roads. http://www.higginstribe.com/tpc/part-throttle-mpg1.mpg 2.5MB
http://www.brullenexhaust.com


[Modified by DirtyLude, 7:45 PM 4/19/2002]

 

If you could also make a 3 inch I would be interested as well.

 

no point in using any resonnator
ehhehe

the stock resonnator is more a muffler thana resonnator
it's built exactly like a striaght trhough muffler

that's why the prelude isn't too loud when u only change the muffler

 

I think of the smaller diameter tubes as resonators and the oval body pieces as mufflers. Thaat's how the terms were used way back when.

 

I could actually do some 3" tubing but I'd need a car ASAP to do some drawings.

 

should make it 2.375
2.5OD is too big unless running a really souped up h22a

 

jim why do you say that? becuase most aftermarket exhausts are 60mm which is ~ 2.3". wouldnt a 2.375 bottleneck the 2.5 collector and 2.5 cat? or by that time, are the gases slowing down because of the distance and you need smaller piping to maintain the velocity?

 

well if you are using a 2.5" cat and collector than maybe it would be ok with a 2.5"

but yest the gazes defenitivly slow down a lot after they have passed the cat ( and using a 2.3/8 after a 2.5 cat would not do anything almost..maybe just help with the venturi effect and accelerate the gazes a little )

but i do think that ( removing the cat wich is not the case of most people in here neway ) a 2.375 " exhaust from collector to muffler would be the best choice of size for the prelude's stock h22a ( or mildly modified )

mugen has done lots of tests with different piping size and they do use 2.375" piping if i remember correctly..they do this with all the cars they tunne

the larger size of piping you use..the more noise u'll have in the exhaust sound too..

so choosing the right size of piping is a thing that must be planned neway ..depending on all the rest of the componants..

 

Well I'm not here to challenge anyone on what size tubing should be used for the exhaust, header primaries and or secondaries. But I respectively disagree with the argument of because one company has done it this way that it must be the way to go. Mugen uses 60mm tubing for the Prelude and the ITR. Lots of systems are built because of what is available on the market. Meaning 60mm tubing is most likely one of the more readily available diameters of tubing in Japan versus say the 63.5mm or anything a little bigger or smaller than 60mm, plus it's bigger than stock. Just like here in the states where one can purchase 2", 2-1/4", 2-1/2" or 3" tubing, bends and mufflers very easily but try and find 2-3/4" mufflers.

Mugen uses a 65mm collector on the JDM header for the ITR but a 60mm exhaust system. Why?

We all know that Honda, Acura, Ford, GM, Porsche or any car manufacturer doesn't build a car that can't be improved upon with good after market parts. Some of these parts are better than others and this is what the consumer will determine.

In general everyone should realize that an advertisement by any company is done for one reason....to sell a product. You buy it because you think you will look better, perform better, feel better, etc.

I don't go out and make claims that my products are the best on the market because I don't know if they are or if they are the worst. I would much prefer my customers to post dyno sheets or other results of tests that they conducted vs me since I think it brings more credibility to the test. If any company or person makes a claim I think they should back it up with proof that can be confirmed but an independent source. But until there is proof a claim shouldn't be made about a product.

Now with that said, we can get back to exhaust tubing diameters for the H22. Since, I'm in the states I have 2", 2-1/4", 2-1/2" and 3" tubing and parts available to build an exhaust system. This doesn't mean that the best size has been listed but these things are compromises. I do know that I didn't loose any low end power when running a 2-1/2" system on a stock ITR and picked up some mid to high end. I also know the gains were more pronounced with further mods of the I&E. My gutt and research told me that 3" is way too big for a NA ITR, so I didn't try it. I didn't want to use 2-1/4" since I knew certain parts of the stock system were 2-1/4" and I know that this system can be improved upon due to how the tubing is done in some sections. I couldn't use 2-3/8" tubing since I didn't want something smaller than the collector, and mufflers and resonators aren't available in that size. So then one is left with 2-1/2". The next step is working with resonators and mufflers or building your own to determine what gets the noise down the best without hurting performance.

Now for the Prelude is was just a simple fact that I had what was looking to be a decent performing system for the ITR and since the power levels were close, that the same size system should do well on the Prelude. Will the 60mm Mugen, Tanabe or any other 60mm system perform better then what I put together? I don't know. If it does, will I build a 60mm system? No, because the parts aren't available to me at a reasonable price. But I also suspect that most people will be trying to make more power and having a slightly (2-1/2" has a 13% larger internal area than a comparable 60mm system) larger system will be better than a smaller one that may start restricting the engine output with further mods.

So the bottom line is the customer is the one that will dish out the money for the system and word of mouth will help determine which is the best one out there or the best bag for the buck.

My intent of the above response was to explain what goes into designing an exhaust system and not to take issue with JinMTVT's statement.

SMSP - Who spends more time sizing header ports, primary and secondary tubing diameters, collector tapers and outlet sizes than the B pipe diameter.

 

well im not worried about that because i saw the ITR picture and the muffler looks almost stock and the gains were huge.

 

ok SMSP...
what you said is totally true..

the reason why i said that 2.375 piping would be better is that i've seen a dyno with tests on that like 6 month ago..i'll try and find out where it is ..

then we've had few people in my prelude club, test with different exhaust..and the systems that performed the best with relativly the same stright though muffler were all less than 2.5"od

i personally think that the best ehxuast for the prelude using a muffler at the end would be something like starting froma a ~2.5" collector tapering to 2"OD piping just before the muffler..but that's impossible to do without stupid costs..

neway ..i'm pretty sure that a welll designed 2.5" will perform the same as a well designed 2.375 if the car is moded to help the flow of the engine..
it'll also depend on what kind of muffler will it be using
and if it is running with or without a cat ..

adn the design of the header will also work on thoose factors

neway ..all in all..you have done great great work and i hope to be able to see more of your stuff soon
( ok i'm changing subject there ahha )

and you don't need to say that you aren't taking issue with me..i know you aren't..
we are just talking car performance..and getting each other's experience and ideas


EDITED --------------
sorry if that don't make sense...i am not always totally clear to myself in english
ahha



[Modified by JinMTVT, 11:38 AM 4/23/2002]