tCtCtC

Alright, I have a fairly easy question. I have a 98 HX (D16Y5) and my current exhaust setup is:
EX Header > OEM cat > 2.25" piping w/ 18" resonator > OBX twin loop

It gets loud and raspy over 4k, so would adding a high flow cat quiet it down? It would be setup like this:
EX Header > OEM cat > Additional High Flow Cat > 2.25" piping w/ 18" resonator > OBX twin loop

Any input is appreciated, thanks.

devney

It probably would, but there are much better options. With your setup, I would imagine it would be pretty quiet already. But since you say it isn't, I am going to guess that either your resonator is crap, or your muffler is crap. I'd look into replacing one of those before I ever put more restrictions in my exhaust.

tCtCtC

I'm considering doing this cause I already have a RandomTech high flow cat sitting in my garage, and I figured it would help to cut down some of the noise.

Libertariat

Just get a longer resonator. Should solve your problem just fine.

Dontoh

how would that fit? wouldn't your exhaust tip stick out further if you add more ****?

tCtCtC

^ Cut out part of the midpipe, weld in the cat. Same thing I would do if I was adding a resonator.

Dontoh

ah.. well its worth i shot, give it a go. not like there's anything to lose

Deetz

exactly correct, the longer the resonator, the quieter it will be. I've done this on many many cars.

My crx was louder than i wanted, so i have a high flow cat, plus a 16" resonator, sounds simply amazing now and not raspy at all

tCtCtC

I know a resonator would solve the issue, but I don't want to buy one if adding the high flow cat will have the same affect.

Deetz

a cat is more restrictive

tCtCtC

I know, I'm not worried about that. I'm wondering if a high flow cat will quiet down the exhaust like a resonator would.

Deetz

it will to some degree

throw your car up on a hoist running, hold the cat at the end of it and see if it sounds better. I've shopped for resonators that way, always get what i want that way

tCtCtC

Alright, I'll try doing that.
Also, if I do get the cat installed, should it be placed between the first cat and the resonator, or between the resonator and the muffler?

Libertariat

You'll feel dumb for having two catalytic converters on your car. Besides, a resonator is a LOT cheaper than a new converter, and less restrictive. A resonator is designed to make your car quieter while maintaining flow. A catalytic converter only does so by it's restrictive qualities, not on purpose.

apexi_rsx

OP says he has the high flow in his garage hows it gonna cost more when he already has one.

grumblemarc

iTrader: (4)

He also seems dead set on using it so no point in discussing it.

Libertariat

I missed that. It's still not a good reason to justify having TWO catalytic converters on your car.

OP: It should really only cost you like $50-60 to get a 22" resonator installed in place of your current resonator, and you should notice a big difference.

You could also perhaps blame your OBX twin loop, replace it with a stock muffler if the 22" resonator doesn't do what you'd like.

VtecFTW1988

A high flow cat although its high flow will still be more restrictive than a resonator as said above.

Catalytic converters were invented to reduce carbon monoxides, now this seems like a good idea but carbon monoxide is poisiness to us but diperses in our atmosphere so it has no real danger unless breathed in straight from the exhuast pipe or gasssed out in your garage or something, but in the atmosphere it is not dangerous.
Now, maggie thatcher our prime minister at the time ( bitch but clever ) of these being invented was a chemist, She stated that cats were a bad idea as they reduce the caron monoxide but they convert it to Carbon DIoxide Which is not a fix at all as this gas maybe less harmful to us but to our planet it is far more harmful..... Basically catalytic converters were a cheap fix exactly the same way that electric cars are a cheap fix as where does electricity come from ??? the power station lol so its less green than anything lol.

what i am saying is by fitting 2 cats on your car you will producing a huge amount of CO2 by fitting a decat and a large resonator you will actually be saving the planet more than you will with 2 cats.
you may even fail your test with 2 cats on there 2 is not always better than 1 if it was designed to only have 1.
think seriously before fitting it.

tCtCtC

I'll do that. vv Provided a good enough reason to not use two cats.

Thanks, that definately helped a lot.
I appreciate the advice guys! One more question: would it be better to go with an 18" resonator, or a 22"?

Deviousjet

Bigger the better for sound reduction.

NotAJDMFanBoy

It should be quiet. Check if you have any exhaust leaks. Seafoam does a good job at that...

TwoFaced

Lol very much so.

Did the OBX twin loop increase in volume after a couple months? I've heard of this from quite a few places.

NotAJDMFanBoy

I thought the OBX twin loop was supposed to be halfway decent, but when I first looked into them, they weren't too well known yet, so...

TwoFaced

I'm thinking about getting one. Mine has an annoying drone at highway speeds.

tCtCtC

Yeah it did. It was perfect in tone and volume when I first got it, but now it's getting loud. It's sounds nice and is quiet under 3500, but once you go from 3500-5000, it gets loud and raspy. I'm probably gonna switch the POS resonator out with a magnaflow 22", so that should quiet it down a lot.

The build quality of it is surprisingly really good, all the welds are neat and it's been holding up just fine so far. My only complaint about it is what I mentioned above, but like I said, a resonator should quiet it back down. I'm planning on writing a review for it sometime soon, just so people can get a better idea of how it performs.