Open Dump exhaust

Wabbyyy · 04-14-2013, 08:28 PM

Today, i have decided to run an open dump before i get my straight pipe. Took off muffler with exhaust tips. Has anyone done this? Is it safe for the car?

Japanjay · 04-14-2013, 08:35 PM

No different than running a muffler delete or the Shorty pipes. Just now all the heat escapes right under your gas tank.... Probably not the best idea. And you might encounter some smell due to it hanging out under the car and not escaping like it would if it ran to the end of the bumper. But sound wise the same as those 2 listed above.

Jordo! · 04-14-2013, 08:51 PM

So it's open from header back?

Noisy, smelly, codes from missing 2ndary O2's, and picked up some top end, otherwise, fine.

Wabbyyy · 04-14-2013, 08:53 PM

Well i still have my muffler and exhaust tips on but its disconnected. The hangers still hold my exhaust but i have a 2 inch gap. I took out the bolts and the gaskets. Any thought?

Jordo! · 04-14-2013, 08:57 PM

Quote:

Originally Posted by Wabbyyy

Well i still have my muffler and exhaust tips on but its disconnected. The hangers still hold my exhaust but i have a 2 inch gap. I took out the bolts and the gaskets. Any thought?

Effectively, they are out of the picture.

If you get a CEL from missing secondary O2's, the ECU might dump fuel in an attempt to protect the (missing) cats, which will eventually kill power, but in general, nothing to be alarmed about.

Eventually you will need to either get a tune or try some mechanical fix for the missing post cat O2's, but otherwise, you will be fine.

CSA0890 · 04-15-2013, 12:22 AM

Not a good idea to run it with the muffler off. Ask me how I know. 150 bucks later for a new bumper bracket I went to a muffler shop and had some pipes welded up to go out the back. Also if you get a funny smell in the cab thats the smell of the plastic bracket melting.

chrischhorn · 04-15-2013, 01:23 AM

I ran it like that till my Litespeed exhaust came in. Only a few days. No issues here but a LOT of drone. Gets very annoying as everything resonates off the bottom of your car. I was running it like that with headers and test pipes and the H-pipe and mid pipe from CNT exhaust. I fully removed my canisters from the rear though so I had nothing on the back end at all. Saved me 30lbs on the exhaust system lol.

jcosta79 · 04-15-2013, 03:33 PM

Quote:

Originally Posted by Wabbyyy

Well i still have my muffler and exhaust tips on but its disconnected. The hangers still hold my exhaust but i have a 2 inch gap. I took out the bolts and the gaskets. Any thought?

I did that. For 1 day.

So I Performed the "Washer" Mod - (Flame-suit ON)

CSA0890 · 04-16-2013, 09:05 PM

Quote:

Originally Posted by jcosta79

I did that. For 1 day.

So I Performed the "Washer" Mod - (Flame-suit ON)

lol I remember when that was first posted. Surprisingly it sounds halfway decent for costing $5

edub370 · 04-16-2013, 10:08 PM

^^... No... It really doesn't. I ran open dump from my storage unit to my house when i did my exhaust install.. it sounds like crap

zefaulter · 04-16-2013, 11:02 PM

I removed my muffler and drove on two separate occasions for 20min total. Sounds good just nasty exhaust smell in the cabin, no melting smell though

Swaffy · 10-02-2019, 10:24 AM

I've been running open headers for over 2 months. DO NOT do this unless you have throw-down pipes because you will melt the undercarriage.

What I did was cut my AAM Short Tails at an angle and bolted those to my Fast Intentions long tube headers. This works really well. You can see them on my Instagram.

Driving in traffic is safer since you're basically rumbling everyone around you so they always know you're there.

FPenvy · 10-02-2019, 10:43 AM

sooooooooo why not just run straight pipe?

when swapping exhaust i've revved it up with just test pipes and the front leads of the FI exhaust on. sounded the same as when the rest of the exhaust on.

2011 Nismo#91 · 10-04-2019, 08:50 AM

Quote:

Originally Posted by Swaffy

- The funniest and best reactions from people. I already have plenty of funny stories to tell. Driving below 2k RPM the engine sounds mean and deep. Someone even asked me if my car was v8 swapped.

- Sounds like a FIGHTER JET when running from 6k RPM to redline. Tunnels will destroy people's ears and it's awesome.

Thats absolutly true.

I have test pipes, mid pipes, and electric cutouts with the stock muffler. Fun at the flip of a switch.

JARblue · 10-04-2019, 11:02 AM

Which cutouts are you using? Any problems with sticking?

04-14-2013, 08:28 PM	#1 (permalink)
Wabbyyy Base Member Join Date: Feb 2013 Location: New Jersey Age: 31 Posts: 126 Drives: 2009 370z Rep Power: 12	Open Dump exhaust Today, i have decided to run an open dump before i get my straight pipe. Took off muffler with exhaust tips. Has anyone done this? Is it safe for the car? __________________ 2009 370z.

04-14-2013, 08:51 PM	#3 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 418	So it's open from header back? Noisy, smelly, codes from missing 2ndary O2's, and picked up some top end, otherwise, fine. __________________ Enjoy it. Destroy it.

04-14-2013, 08:53 PM	#4 (permalink)
Wabbyyy Base Member Join Date: Feb 2013 Location: New Jersey Age: 31 Posts: 126 Drives: 2009 370z Rep Power: 12	Well i still have my muffler and exhaust tips on but its disconnected. The hangers still hold my exhaust but i have a 2 inch gap. I took out the bolts and the gaskets. Any thought? __________________ 2009 370z.

04-15-2013, 01:23 AM	#7 (permalink)
chrischhorn A True Z Fanatic Join Date: Jan 2012 Location: Mililani, HI Posts: 1,566 Drives: 2014 Juke Nismo RS Rep Power: 16	I ran it like that till my Litespeed exhaust came in. Only a few days. No issues here but a LOT of drone. Gets very annoying as everything resonates off the bottom of your car. I was running it like that with headers and test pipes and the H-pipe and mid pipe from CNT exhaust. I fully removed my canisters from the rear though so I had nothing on the back end at all. Saved me 30lbs on the exhaust system lol. __________________ R.I.P. 8/01/13 1SlowZ One day I'll have another....

04-16-2013, 10:08 PM	#10 (permalink)
edub370 A True Z Fanatic Join Date: May 2011 Location: KCMO Posts: 3,458 Drives: 09 370z S/T 6MT Rep Power: 20	^^... No... It really doesn't. I ran open dump from my storage unit to my house when i did my exhaust install.. it sounds like crap Zezus likes this. __________________ 09 370Z ST 6MT//Injen CAI//Greddy CBE//TP//TSW's//Swifts//Stillen lip//Whiteline sways 326whp/268tq Last edited by edub370; 04-16-2013 at 10:13 PM.

04-14-2013, 08:35 PM	#2 (permalink)
Japanjay Track Member Join Date: Mar 2012 Location: Puyallup Posts: 856 Drives: 09 Nissan 370z MB M6 Rep Power: 14	No different than running a muffler delete or the Shorty pipes. Just now all the heat escapes right under your gas tank.... Probably not the best idea. And you might encounter some smell due to it hanging out under the car and not escaping like it would if it ran to the end of the bumper. But sound wise the same as those 2 listed above.

04-15-2013, 12:22 AM	#6 (permalink)
CSA0890 Base Member Join Date: Nov 2011 Location: Oklahoma Posts: 174 Drives: 2011 Tour/Spt 7AT Rep Power: 14	Not a good idea to run it with the muffler off. Ask me how I know. 150 bucks later for a new bumper bracket I went to a muffler shop and had some pipes welded up to go out the back. Also if you get a funny smell in the cab thats the smell of the plastic bracket melting.

04-16-2013, 11:02 PM	#11 (permalink)
zefaulter A True Z Fanatic Join Date: Jan 2013 Location: Toronto, Canada Posts: 1,983 Drives: 40th 370Z Rep Power: 27	I removed my muffler and drove on two separate occasions for 20min total. Sounds good just nasty exhaust smell in the cabin, no melting smell though

10-02-2019, 10:24 AM	#12 (permalink)
Swaffy Base Member Join Date: Mar 2019 Location: Cibolo, TX Posts: 9 Drives: 2020 Deep Blue Pearl Rep Power: 6	370z Open Headers I've been running open headers for over 2 months. DO NOT do this unless you have throw-down pipes because you will melt the undercarriage. What I did was cut my AAM Short Tails at an angle and bolted those to my Fast Intentions long tube headers. This works really well. You can see them on my Instagram. Driving in traffic is safer since you're basically rumbling everyone around you so they always know you're there. Last edited by Swaffy; 12-19-2019 at 11:14 AM.

10-04-2019, 11:02 AM	#15 (permalink)
JARblue A True Z Fanatic Join Date: Mar 2011 Location: Austin, TX Age: 43 Posts: 36,450 Drives: 11 Z34, 98 E36 M3 Rep Power: 2684440	Which cutouts are you using? Any problems with sticking? __________________ 2011 370Z 6MT Sport Gun Metallic \| ARC \| CJM \| Ecutek \| FI \| Fujimura \| R2C \| SPL \| Stillen \| TWM \| Z1 \| ZSpeed \|

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