+ 370z Muffler Delete +
 

Past weekend i was bored so i decided to remove my muffler box and see how the exhaust note would change. I had a bad feeling about it but it only took ~30 minutes....turned it on and was surprised :eek:. Anyways its a tad to loud for my style but love the deepness...now im going to get some nice tips + piping fabricated. For now this will be temporary as i do not have the funds to buy a full exhaust system...that will come later. Here is a quick vid i made :tup:

YouTube - 370z Muffler Delete No Music

It sounds better than I would have expected lol. But I wouldn't expect any serious power bump from this. The mufflers aren't the problem with the exhaust flow, it's the cats and Y-pipe mostly.

Wow, I'm surprised at how quiet/tame that sounds. I think this hints at how restrictive the stock cats really are (vs. the muffler), because if you listen to a Z with HFCs and the stock cat-back (incl. the muffler), it's more aggressive sounding!

That's actually not bad at all.

nothing to write home about.

I'm pretty impressed, I was expecting something horrible coming from this. Sounds pretty good. When I changed the HFC is sounds louder with the stock muffler on...lol

I agree, it does sound good. I think this is really valuable information, actually, because it opens up a new avenue for modification. Specifically, what I'm thinking of is people who might want a deeper sound, but don't want to mess with their cats. Or maybe they live somewhere where it's absolutely forbidden to touch the cats. Well, now they have an option other than replacing the cats -- just delete the muffler. Now all we need is for someone to make a bolt-on kit so that you can just bolt some pipes/tips in place of where the muffler used to be.

The muffler is what is supporting the rear end of the exhaust, so if you take the muffler off the exhaust is just flopping about. So any tips you make up will need to have a bracket attached.

That actually sounds sick - just dont melt your bumper like this guy

Wow.. that sounds like a nice exhaust is already on the car.. I might do this for a week and see how I like it.. maybe it'll give me an idea of what it's like to own an exhaust? Thoughts?

Edit: Yikes, it looks like the pipes are pointing upwards into the car? Think that will burn something up?

I think it'd be risky to drive around like that for any prolonged length of time.

I'm still waiting on my 5zigen exhaust which is still about two weeks out. I may do this until my exhaust gets here. I dont have any long drives planned between now and then so I think I'll be okay, plus it means less to take off when it gets here.

Ahhhhh...nothing like the odorless fumes of carbon monoxide in the morning whilst driving to Richard Wagner's "Ride of the Valkyries"!

Batman when you were making your video did you happen to check and see how hot everything got underneath with the exhaust after you made your runs.

I did this to my car before I got any aftermarket parts.

I ran it like this for right at one week. I did worry about fumes, heat, melting things, but I kept checking and everything looked fine..... I also made sure I was always moving.... and even shut it off at stop lights.

The sound is bad azz. It's way racier than my Stillen exhaust, but is about twice as loud (3db). I love the "cackle" when you come off the throttle for shifts or when when you use compression deceleration after downshifts.

If you chop up your rear muffler section and reuse the tips, you could have "custom" exhaust a system built for under $100.

The downsides: 1) It's too loud for everyday use and would be annoying on long drives or taking your boss to lunch. 2) you could easily get ticketed with that sound level if a cop saw you on the throttle. 3) It's still small diameter tubing and you're probably not ganing hp. 4) There's a lot of droning. This may be from exhaust pulses hitting the heat shield over the gas tank and may go away with exahust tips in the appropriate location.

PS. Batman, can you repost the original "muffler delete" video to youtube without the music or post that video to a different site so we can see the full length vid in all its glory?

Thanks,

Phim

http://www.the370z.com/intake-exhaus...e-exhaust.html

???

How would removing the mufflers effect the level of CO emissions?

The video sounds really good BTW.

I would think that it won't have any impact. Mufflers are strictly for sound suppression. As far as emissions control goes, that's what the catalytic converters are for. The exhaust gases have already been 'scrubbed' by the time they get down to the mufflers.

I tried uploading my original vid to youtube, photobucket, myspace, and some other forum and couldn't get audio because of the rights.

It was hot but can't make an accurate calculation as the street is burning hot as well.

Negative sir, don't have any CO smell....i think that comes along when changing the catalytic converters.

Highly doubt it will to much damage. As someone mentioned that the pipes point upwards, i noticed that there is an aluminum shield (silver thing in vid) that takes the heat from the pipes....not saying its OK as i think that shield protects the gas tank from heat but it should be fine for a week or so before i get some tips customized.


Thanks on the feedback, makes me feel that my Z sounds possessed now....especially when downshifting :tup:

Have you noticed a drop in fuel economy or other undesirable outcome from the reduced backpressure.

With some new pipes, mounts and tips, this seems to be a cheap mod.

CO is completely odorless, and deadly. I don't recommend you go sniffing your exhaust. :p And Semtex is correct, the muffler has nothing to do with emissions.

Did nothing for me....

Just remember I muffler deleted my WRX weeks after I bought it and I remember it sounding like complete crap.. But it was fun being loud for a few days.

Fuel economy has been affected but i blame it on myself since i've been accelerating more than usual just to hear the exhaust :icon17:

I plan on getting this cheap set-up done by mid next week. In my meantime i'll wait for a bigger variety in exhausts.

That doesn't sound bad at all really.

Took mine off today after reading this post. Its sounds pretty good but is a little loud for me, only took 15 minutes to remove. I'll probably leave it off until my exhaust comes in a couple weeks.

it actually sounds waaay better then i expected.
sounds more beefier now.

Wow that sounds really nice. I'd like something like that, but a bit smoother with the exhaust on and not as loud lol.

With just the Berk HFC and the stillen Gen 3 intake and a full (OEM) cat back. Would it sound anything close to this?

Guys, I don't intend offense to anyone, but unless this actually produces a functional gain (i.e., power), this mod is rice, pure rice. It's a sound-only mod; the auditory equivalent to plastering stickers all over your car. All show, no go. Like a Toyota Tercel with a fart-can exhaust and a huge rear wing. Having said that, will it produce any real gains? I highly doubt it, personally, but we really don't know at this point. We need to have a before and after dyno test performed to know for sure. Again, I'm not trying to offend. I'm just calling it like I see it.

^ true, but for those of us still waiting to replace our stock exhaust it still could be something fun to screw with to pass the time :)

the stock muffler is so huge but does almost nothing for the noise......damn those cats...lol

I agree with you Semtex. I think most people are just amazed that it doesn't make an atrociously terrible sound. I wouldn't think for one moment to do this but I'm still really surprised that it actually results in a somewhat decent tone.

it doesnt sound bad, but it you put HFC's on and leave no muffler...man, that's gonna be loud....lol.....do it with some \/ pipes with tips.

Oh I agree about being surprised that it doesn't make a terrible sound. Don't get me wrong -- like I said in my original post to this thread, I think this little experiment yielded some valuable information, and I'm glad batman_4 did it. Specifically, if we remove the mufflers and it still sounds reasonable, I think we can infer that the stock cats are really, really restrictive. I think we've all pretty much known that for a while anyway. But this just confirms our belief.

While I do agree that there is likely not much of a gain to be had by deleting the muffler...there is, however, quite a bit of weight savings in dropping that thing off the *** end of the car. Now, it's not dropping weight where we would prefer (front end), but it is dropping weight none-the-less. No HP gain but a reduction in weight is still considered a performance increase. :nutswinger:

I disagree about this being a rice mod. As pointed out, the weight, but also, it's like taking a Lamborghini Gallardo and putting aftermarket pipes on it. Sure, you only gain 10hp on 560, but it makes such sweet music. It's a more satisfying mod than removing my Bose sub and adding a 12" speaker and amp. To some it's just noise. To me, it is music. Unfortunately inline 4's don't sound like music unless they spin faster than 10,000 rpm. For that reason, my Yaris, which is lowered, has aftermarket swaybars, shocks and Momo wheels, has a STOCK exhaust.

It's not that it changes the ammount, it could potentially be a problem dropping CO under the floorboard instead of out the back, especially when idling.

Stock exhaust has 2 cats, 2 diffusers and one muffler. I don't think it's neccesarily fair to say it's the cats cutting the noise. You've got me curious enough to unbolt the rear section of my stillen exhaust to see if it's the cats or the diffusers....

Yeah, I have to admit that I neglected to take the weight-savings aspect into account, so I guess it's not entirely rice. I still think it's a poor substitute for getting a proper aftermarket exhaust though. Just my opinion.

Replacing just the stock cats with HFCs and leaving the stock cat-back in place produces a significantly louder exhaust note. DDMotorsports has a vid clip showing this. From this alone it's obvious that the stock cats are having a noise-suppressing effect. Are you suggesting otherwise? That the stock cats aren't cutting any noise? Yes, the resonators are cutting noise as well, but if the stock cats didn't cut any noise, I don't think the HFCs alone would produce as dramatic an increase in sound as they do.

I agree, but it's a personal opinion. Some people really only enjoy the sound that the exhaust gives and don't mind if there are no power increases. Just wanted to point out the weight factor since weight reduction is definitely a big topic for the track. :tup: