2.5" tubing / 3" tubing make a difference in sound on a KA? - and resonator question

Post by **onosqv** » Tue Aug 17, 2004 7:59 am

Hey guys, I'm just wondering if 3" tubing would be louder than 2.5" tubing given everything else (muffler, resonator, etc) is the same?

Also, on my current 2.5" exhaust, I already have 2 resonators on that thing. Will adding another resonator affect performance?

Thanks,

Post by **PhaneSoul** » Tue Aug 17, 2004 7:59 am

it will effect sound, i dont know how, but i heard 3in exhaust sound killer on a n/a ka 240, my friend has one

Post by **onosqv** » Tue Aug 17, 2004 7:59 am

PhaneSoul wrote:it will effect sound, i dont know how, but i heard 3in exhaust sound killer on a n/a ka 240, my friend has one

Thanks for the info. I'm actually trying to see how much I can do w/o increasing sound

.

I will be going turbo too in a few months as I continue gathering parts. Some people (very few) are already complaining w/ my 2.5" header, 2.5" exhaust noise. It is a very deep noise which you feel as well as hear, haha. I luv it, but some people just can't appreciate it, hahaha.

Post by **tar0icy_w/tapioca** » Tue Aug 17, 2004 7:59 am

dude, if u r going to sport a 3" dont be conservative, if u want quiet then stick with stock, my catback is loud but i'm not an a$$ about it, i live in a very neighbor hood where all the houses are close together, but i dont rev my engine in the middle of the ****ing night like the A$$hole with a turbo EX, its all about taste, and like i said, there is no bad car, only bad driver

Post by **onosqv** » Tue Aug 17, 2004 7:59 am

tar0icy_w/tapioca wrote:dude, if u r going to sport a 3" dont be conservative, if u want quiet then stick with stock, my catback is loud but i'm not an a$$ about it, i live in a very neighbor hood where all the houses are close together, but i dont rev my engine in the middle of the ****ing night like the A$$hole with a turbo EX, its all about taste, and like i said, there is no bad car, only bad driver

I totally agree. None of my neighbors have complained. Every time I drive into a neighborhood, I pretty much run off idle or below 2k rpm.

Some people agree it's loud, but they don't necessarily find it obnoxious.

It was just that ONE neighbor at my gf's place that didn't like it. I was basically idling from the street in, too. The only reason I was even considering silencing my car, etc. is that I come over there a lot, and don't want to get my friends in trouble (they got kicked out of their last place because of similar issues - as well as a few others

).

Definitely thanks for the responses though guys.

Post by **Spongebob** » Tue Aug 17, 2004 7:59 am

my car is dam deep with the 3in catback. its fun to make alarms go off at night.

Post by **DammitBobby** » Tue Aug 17, 2004 7:59 am

"Hey guys,I'm just wondering if 3" tubing would be louder than 2.5" tubing given everything else (muffler, resonator, etc) is the same?

Also, on my current 2.5" exhaust, I already have 2 resonators on that thing. Will adding another resonator affect performance?

Thanks,"

Save the money and continue to use the 2.5 exhaust.

Post by **Kinesthesia** » Tue Aug 17, 2004 7:59 am

I still think it's a valid question, worth knowing the answer to, if anyone knows.

Post by **Julio Bro!** » Tue Aug 17, 2004 7:59 am

The S13 factory setup uses one, very restrictive, resonator. Eliminating this makes for better flow, but brings a bit louder tone and vibration to the system. Stepping up from 2.5" to 3" would have a similar effect because of the bigger sound wave.

The resonator you use should be the closest thing to a straight tube in order to maintain flow. A glasspack or flo-thru mufflers qualify for this, and also should be the same size as the rest of the tubing. This is particularly important since some glasspacks and flo-thrus are actually smaller inside than the connecting tube.

So to answer the questions:

1) Changing from 2.5" to 3" will bring a bit of volume and vibration, but just a bit...literally a bit, nothing to worry about.

2) Adding another resonator will affect performance because it brings a loss in flow, but if you make sure all of them are straight and same size internally as the connecting tube, the loss is minimal or close to none.

I wouldn't use more than one resonator and you have 2 already, it's almost overkill. And remember this brings weight to your car also.

Post by **Shorty65** » Tue Aug 17, 2004 7:59 am

I've got a 3" w/o resonator on my N/A KA right now and it sounds really good. Nice and deep. When I'm just running around town I put in my silencer. Still sounds pretty good and very tolerable. You barely hear it at idle. I've only done one autocross with it since I got it. It sounds really deep and gets you noticed when you open it up w/o the silencer. (I guess this all kinda depends on which catback you decide to get as well)

Post by **AZhitman** » Tue Aug 17, 2004 7:59 am

Julio is 100% correct. Good work Julio!

p.s. All of our resonators are AT LEAST the same internal diameter as the piping we install them in. We won't install one that creates restriction, just like we will never sell a system with a silencer.

Post by **onosqv** » Tue Aug 17, 2004 7:59 am

AZhitman wrote:Julio is 100% correct. Good work Julio!

p.s. All of our resonators are AT LEAST the same internal diameter as the piping we install them in. We won't install one that creates restriction, just like we will never sell a system with a silencer.

Yea, I was in the process of ordering a BRM exhaust, but they were back-ordered for the s13, and I found a great deal on the Trust/Greddy SP.

Just a tad too loud for other people's taste, not mine

.

I'm saving up for a BRM exhaust in the "distant" future.

Post by **marshun** » Tue Aug 17, 2004 7:59 am

my 240 has a 3" pipe from the header to the back of the car. response is unbeatable. but it is really loud. i think you've got the right idea for using a couple of resonator's. but those things are heavier than just a pipe. idunno if weight is an issue with you. but if you switch to the 3" and you want it quiet, i guess you should probably put some resonators on there too. im not running a cat or a muffler though.

Post by **greazymule** » Tue Aug 17, 2004 7:59 am

no cat or muffler? awesome. i am planning on fabbing an exhaust for my 240 and i was thinking of not using a cat, resonator, or a muffler. would that be absolutely obnoxious? any sound clips. what muffler would you guys reccomend for taht setup? i plan to go turbo so it would be a 3 inch. would a generic flowmaster sound decent? i am looking for cheap

Post by **AZhitman** » Tue Aug 17, 2004 7:59 am

It would be obnoxious.

Cheap and quality are often mutually exclusive. Stay away from junk mufflers.

Post by **mattc240** » Tue Aug 17, 2004 7:59 am

Yeah guys I need a muffler made for a 240....When I first got my 240 I took the "performance muffler" I bought at an Import shop (mainly for Civics) off of my Talon...And it sounds good at low rpms but when you open it up....it sounds like 2 bumble bee's racing...........and plus it backfires right when I don't want it to...Like in front of everyone in town.... :@ So Hitman what do you say for just the muffler...There is a exhaust shop in my town that is good and they don't charge you nothing but just for the pipes needed for your car and I am running a 2 1/2 Exhaust...no cat...Just that stupid muffler...Would upgrading the headers help any??

Post by **onosqv** » Tue Aug 17, 2004 7:59 am

mattc240 wrote:Yeah guys I need a muffler made for a 240....When I first got my 240 I took the "performance muffler" I bought at an Import shop (mainly for Civics) off of my Talon...And it sounds good at low rpms but when you open it up....it sounds like 2 bumble bee's racing...........and plus it backfires right when I don't want it to...Like in front of everyone in town.... :@ So Hitman what do you say for just the muffler...There is a exhaust shop in my town that is good and they don't charge you nothing but just for the pipes needed for your car and I am running a 2 1/2 Exhaust...no cat...Just that stupid muffler...Would upgrading the headers help any??

Upgrading the header is arguably more beneficial than the exhaust since the stock header is much more restrictive.

I believe Hitman uses Magnaflow mufflers (and custom mufflers from Magnaflow) to obtain that awe inspiring low soft roar on his famous exhaust systems.

Post by **mattc240** » Tue Aug 17, 2004 7:59 am

I want the hook up Lol

Post by **onosqv** » Tue Aug 17, 2004 7:59 am

mattc240 wrote:I want the hook up Lol

search on eBay for 240sx exhaust.

There is the BRM version somewhere on there, custom made to order. As far as I'm aware, those are as good as the prices get, unless AZHitman decided to give the Nico guys an even bigger discount (it's already a hella good price)?

Post by **TrunkMonkey** » Tue Aug 17, 2004 7:59 am

brokeAs240sx wrote:Upgrading the header is arguably more beneficial than the exhaust since the stock header is much more restrictive.

not in the case of the 240sx. upgrading the header and still using the 1.waytofreakinsmall" choke bent exhaust would kill a lot of the gains you would see from a header upgrade.

the stock exhaust manifold isn't so bad that a catback upgrade shouldn't come before a header.

-demetrius

Post by **Julio Bro!** » Tue Aug 17, 2004 7:59 am

greazymule wrote:no cat or muffler? awesome. i am planning on fabbing an exhaust for my 240 and i was thinking of not using a cat, resonator, or a muffler. would that be absolutely obnoxious? any sound clips. what muffler would you guys reccomend for taht setup? i plan to go turbo so it would be a 3 inch. would a generic flowmaster sound decent? i am looking for cheap

Using only an exhaust tube is not gonna be obnoxious inside the car, there should be no droning. But outside it will be like drag racing, you should be careful about cops and neighbors.

Regarding the appropiate muffler, do a search in the forum for turbo systems, many people have done that system already.

Post by **marshun** » Tue Aug 17, 2004 7:59 am

greazymule wrote:no cat or muffler? awesome. i am planning on fabbing an exhaust for my 240 and i was thinking of not using a cat, resonator, or a muffler. would that be absolutely obnoxious? any sound clips. what muffler would you guys reccomend for taht setup? i plan to go turbo so it would be a 3 inch. would a generic flowmaster sound decent? i am looking for cheap

well im just going to say its damn loud. its a track only car. thats the reason for it. but driving to the track.... i keep the rev's under 2k.

flowmaster wouldnt sound to hot on our cars. straight through mufflers dont really restrict any different than others. theres some cheap knock offs on ebay if money is an issue.

but my set up is definitely not for daily use. youre going to make people deaf if youre pushin it.

Post by **tar0icy_w/tapioca** » Tue Aug 17, 2004 7:59 am

if the question is about the performance between 2.5 and 3 inch the i'll tell u now that 3" cat back that is as straight as posible, w/ a slanted muffler to make the last part even straighter, w/out silencer, resonator....etc is just right for a KA w/ hot air intake, people complain about loosing bottom end, when do u ever see the bottem end when u are racing, if u did then u've just lost, resonators, cat-converter, anything that stands in the way between the end of the header and the open end of the muffler (even the bends) will slow down ur exhaust flow, but since its almost impossible to fit a straight pipe on there (mounting points and **** u know) u'll have to settle for mandrel bended pipe, cat can be swap out for high flow ones (though ideal is no cat at all)i'll tell u though, a well made muffler is the different between loud, and loud and obnoxious, mine need a new muffler

2.5" tubing / 3" tubing make a difference in sound on a KA? - and resonator question

2.5" tubing / 3" tubing make a difference in sound on a KA? - and resonator question

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