I have come to the conclusion that I want to redo my exhaust, b/c the current setup I have is insanely loud and annoying. The only problem I am running into is that I do not want to disrupt flow, but at the same time make it quieter.

My current exhaust setup is, a JDM ITR 4-1 exhaust manifold connected to 2.5" custom piping all the way back to an Apexi N1 muffler. All of this is on an allmotor B18b.

I have been researching and read an article that claimed that you can build a quiet no loss exhaust system. Well that is what I want to do. Now I have been looking but have yet to find the thread where Dave at SMSP tested various catalytic convertors, and actually had one that flowed very close to a straight pipe. I believe it was made by carsound(not sure though). However to make all legal, I want to run a catalytic convertor, but I want to run one that has the greatest potential of flow.

Next on my list is a resonator. My problem here though is I do not know much about them and wonder if this will disrupt flow as well. I also wonder is this needed or just extra crap that I will waste money on.

After that is the decision on which type of muffler. Here again i have read that you want to select a muffler that has the greatest potential of flow. However though I do not know which style muffler to run; straight thru or baffled. From the article I read, it stated that baffled was the better design b/c it breaks up the exhaust pressure waves. Also I am having a hard time getting manufacturers to give up the flow test data on their mufflers(for the exception of Flowmaster and Dynomax).

All components in this system will be 2.5" ID, and I will be using mandrel bent piping instead of the crush bend **** I got now.

If some of you gurus out there could chime in and give me your advice, I would appreciate it. Remeber the goal is to build a more stock looking, quieter exhaust, without hurting flow and power production.

 

I lost less than 1 hp when I installed a 22 inch resonator in a previously unresonated exhaust. Also consider the use of a Magnaflow oval muffler, it's much quieter than the N1 style mufflers and offer little restriction.

 

not a easy question....

Great flow and quiet is hard to obtain..A exhaust setup that offer great flow will be loud.....For my self i have a spark header 2.5 cherry bomb resonator 2.5 kteller cat-back and a vibrant muffler..Maybe 2 months ago i runned the dynomax superturbo muffler,total waste i think .You should go with straight tru muffler...

i hope it will help ya because i was in the same boat with my b16

for a idea of the muffler... https://honda-tech.com/zerothread?id=1146294


edit: this link also can help ya..https://honda-tech.com/zerothread?id=856670

 

Well I re-read that article and discovered some good advice. The article states that for optimium flow you should have a minimum of 2.2 cfm of flow for every 1 hp produced. Also it stated that most exhaust manifolds have tuned length primaries and collectors, and hooking up a testpipe instead of some type of termination box(cat or resonator) will make it seem as if I have a really long collector and will affect power. It also stated that you only need 1 termination box, so you dont need both a cat and a resonator unless you are looking to make it really quiet.

From what I have read I am thinking of either running a resonator in place of the catalytic convertor, 2.5" mandrel bent piping back to a high flow muffler. I have been looking and like the Dynomax Ultraflow SS, but think that 1100 cfm flow potential is overkill. I wonder what the 2.5" oval mufflers that kteller offers flow?

If I were to run a high flow cat and a resonator will it affect my power production, or should I just run one(a cat) or the other(a resonator)?

 

Bump for advice

 

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