I thought the job of the catalytic converters were to convert carbon monoxide into carbon dioxide? If I am missing something please, don't hesitate to educate me. Anyways, shouldn't the people with LTH, HFC, or Cat-delete worry more about carbon monoxide?

Did u guys feel power lost?

Take some vids! :tiphat:

:D Sounds awesome right??? Hehe! Post a video if you can :D even a picture will suffice.

I don't know :).. Only a dyno would prove so otherwise.

yeah but do you feel any prior to the "mod" ?

To be honest, I actually don't know. It's too hard to tell.

There's no way of knowing

This may be weird, and I guess don't answer if you don't want...but just purely out of curiosity what ethnic background is your family?

I kinda want to Lol to that statement.

We are Filipino.

Subtle question is subtle!

Reduces the levels. HFC's are not an issue.

Reduces the levels to where it's not really significant. Right?
I would worry more if I had open headers, LTH, Cat-deletes.
Another question would having HFC's be as efficient as stock cats or would it let through more carbon monoxide compared to the stock ones..

Hmm . . . if that were true, then how is it that people are able to commit suicide by piping exhaust gas into their cars. You know what I'm talking about right? Some people connect a hose to their tailpipe and channel the exhaust back into their car to kill themselves, and it's not like they remove their cats before doing this. Heck, some people just shut their garage doors with the car running and even that will do the trick. So obviously cats aren't reducing the CO levels to insignificant levels. With LTH, test pipes, etc., the difference is that the exhaust gases -- dangerous as they are -- are being ejected all the way out the back via the tailpipes. The gasses aren't leaking out underneath the car. If they were, that would indeed be cause for concern, and I don't think that changes just because you have stock cats on.

Now, having said all that, I don't think you need to worry unless you have a habit of just sitting in your car with the engine running at idle for extended periods of time. Just driving forward should negate any danger from the gap in your exhaust.

:icon18: I am too. :icon18:

Thanks for your response! I know the cats are not completely depleting the harmful gases, but when people do that.. (running hose to their car, not opening the garage) I think what is killing them is the carbon dioxide. Of course, there will be some monoxide, etc. but the carbon dioxide itself is pretty dangerous as well. Like sniffing your own fart for long periods of time.
Well, when people run LTH, test piptes, etc. shouldn't the people behind them worry? I mean in traffic you would be spitting out harmful gases straight to their car/intake/windows/etc..

:rofl2::rofl2: I don't know about you, but that's something I try to avoid. LOL.

I guess. But I don't think it's worse than getting stuck behind some nasty dump truck or whatever spewing out clouds of black diesel exhaust. Actually you know what I hate the most? School buses! I hate getting stuck behind those things. Their tailpipes are right there at the perfect level to dump all the exhaust into your vents, and I the fumes are just nasty! Anyway, I guess what I'm trying to say is that there's no reason to single out sports cars with cat-deletes when there are so many other nasty vehicles out there that seem to get a free pass (at least in my area). Heck, in my area, dump trucks don't even need license plates! So they drive around spewing out rocks to chip everyone's paint, and you can't even track them down to complain or ask for compensation.

Ah hehe :) true.. I'm just wondering though because I am a noob and I don't know much about the mechanical aspects of a car. However, I am pretty much capable of identifying and classifying cars! I've loved cars since I was little.

Just curious about the monoxide stuff since I don't want to die.

Don't worry....A lot of people didn't believe Darwin either!...:bowrofl:

Hi Modshack! I might be misunderstanding you, but are you implying that I don't believe that this mod will kill me like the people that did not believe in Darwin?

I'm confused :ughdance:

Out of pure curiosity and the fact that I can't visit youtube at work, I added the washers to my muffler. It really sounds good. I manual-shifted all weekend and even had my neighbor do fly-bys. Thanks Gunzero for making my Z sound better. At least until I get my catback.

Haha sounds awesome huh! :) No problem.. all credits go to "ddharon"

I had my dad do the same thing xd it sounds good from the outside as well :)
The exhaust sound amplifies when you go past 3k rpm and has a nice tone to it.

You have an automatic 370z I assume?

They die from carbon monoxide poisoning, not carbon dioxide poisoning. :tup:

LOL at the fart comment.

I suppose if he lives in the Boonies he's safe, but if he has a habit of sitting in Houston rush-hour traffic, he might lose a few brain cells :icon17:

Hey gunzero, what sizes were the washers used? And how many did you use per side?

without a doubt I am doing this in 3 weeks when I get a break from the hospital. To think that I was about to pull the trigger on a $1200 + catback :( I don't really care about the gains... I just want a nicer tone.
Thanks for the great Idea.

Auto for the wifey. The things we do for love.

I used 16(4 for each stud) three eighths stainless washers from lowes. Just over 6 bucks.

I personally would suggest ppl to actualyl get pipes bent with tips if you dont' want gains and just want the sound.

1) All the exhausts would go out the back and not have any running around the bottom of your car

2) When you floor it the exhaust sound doens't open up as much as a CBE or muffler delete cause enough gases are going through the muffler.

Lulz :3 Yea.. however carbon dioxide is also a culprit xd. Must.. breathheee.. Oxygennnnnn!

Anybody that lives in Houston might lose a few brain cells :D

Hey Chriz! What ctspeed said:

Hey Csquared good points! This is only as a last resort. People should look into getting pipes with tips fabricated. However, living in the middle of nowhere has caused me to do this mod.

I agree that more exhaust does flow through the muffler at higher RPM thus muffling most of the sound, but it still sounds awesome especially 3k+ rpm. This also doesn't attract cops as much.

Thanks!:tiphat:

I did it over the weekend with 2 washers each bolt (8 total) and the sound is just right for me. See below for the cold start video (It is actually 5X louder in real life).



Sorry I did not want to rev it too much the rev was actually only up to around 4-5 RPM (the Z limits your rev when it's cold start). But just wanna say I'm extremely happy with the results for such a simple mod. Thanks Gunzero! :tup:

Sounds like a leaky stock exhaust to me. Oh wait, nvm.

WTF!!!!!! I can't belive you guys! This is the kind of sh!t you do to an old beat out camaro or mustang! Somebody please go and rescue those poor 370Z's and find them a proper home!!!

One face palm just doesent cover this one. You guys are killing me here!!! You have purposly created an exhaust leak which exhaust fumes are going to get into the cabin of your car and KILL you!!

Seriously, how is this conversation still going? lol

Oh c'mon now. This is valuable technical information people are sharing here. :rolleyes:

Why not do a more permanent solution? Drill a bunch of holes in the muffler. Problem solved!

You know someone's gonna read that and say 'Oh that's a great idea!' and then do just that, right? :facepalm:

Call it the Bobo Speed Holes. OTW to the patent office, right now.

Make sure you mention the weight-saving aspect of this custom mod in your patent application. :ugh2: