1998 Honda Civic Headers

JACKOLSON

MEMBER
1998 HONDA CIVIC
4 CYL
FWD
MANUAL
60,000 MILES

Hi.

My friend is asking my help for a Honda project. He wanted to install separate header/exhaust, 4 of them, separately into each exhaust port of his vtec vti engine. I asked him why, he said, well, they have done the same to some early honda bike engine like the 750 and well yup, I also realized that, some 4cyl 4stroke bike engines have either 2 separate exhaust and some even have 4, one for each. So we beg to ask, why can't we go and do it on a car engine? Right?

We're planning to install 4pcs of 1.5" header pipes going down to their own flanges then to their own mufflers, one each, then straight out the back into one resonator.

Please, need inputs so I can say "yes" or "no" to my friend and call him either genius or crazy.

6 Replies

MHPAUTOS

MECHANIC
31,937 POSTS

Hi there,

Well that is taking a tuned exhaust to the max, frankly I feel it is a somewhat over kill, standard headers with a reasonable pipe dia and sports mufflers, should do the job, I feel that with all the pipe work and mufflers, (you really going to fit 4 mufflers?) Is just far to bulky and not at all necessary, would be keen to see what it reads on a dyno, but I feel it is a project not wort taking on.

Mark (mhpautos)

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Wednesday, November 18th, 2009 AT 2:46 AM

JACKOLSON

MEMBER
67 POSTS

Thanks. Just what I had been thinking while waiting for your take on it. I mean, the guy just wanted to go for it because he wants to sound different without using large pipe. So I'm gonna give him a hold down on that Honda project, and maybe just go for a 4-1 header with sports muffler.

Can you explain what the specs are for a good sports muffler?

Is it worth installing a resonator/exhaust tip? It somehow brings back the noise that the muffler cancels.

Can we just remove the muffler? And install a downpipe instead? Thinking of a 36" x 4" downpipe.I don't know.

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Wednesday, November 18th, 2009 AT 8:46 AM

MHPAUTOS

MECHANIC
31,937 POSTS

There are many variants of muffler and resonators that you can use, two things that you have to take into account, open fast flowing exhausts will be noisy and can reduce engine back pressure which can affect power output, the theory behind exhaust noise is the faster you cool and slow the exhaust flow the quieter the exhaust, it is a fine balancing act to get it right, and if its a note you want, you will have to talk to an exhaust specialist, this will be a case of owners choice, as my idea of a good note may not be yours, I would talk to Honda sports clubs and see what they are doing, remember it will be expensive to just bolt on and try, best to listen to a few and then make up your mind.

Mark,

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Wednesday, November 18th, 2009 AT 3:31 PM

JACKOLSON

MEMBER
67 POSTS

Thanks for the advice.

Hey, btw, what pipe materials would you choose?

Stainless - that gets hot but is durable
Non-stainless - which is not that hot but not that durable

or any idea of the best one?

I am after durability and longevity but is safe

thanks again.

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Friday, November 20th, 2009 AT 2:22 AM

MHPAUTOS