Recent Topics
Dump or Pump
by TheLawnRanger
03/23/18 11:38 PM
2007 Corolla; low idle and overheat condition
by Rolla07
03/23/18 11:32 PM
Coolant dye - Interdynamics 375CS Radiator/Coolant
by Ndx
03/23/18 10:15 PM
Amsoil OE
by 02z
03/23/18 09:07 PM
Pennzoil Rebate Question
by klt1986
03/23/18 08:47 PM
Electrician's advice? I need help!
by 14Accent
03/23/18 08:40 PM
Disposing of coolant?
by HoosierJeeper
03/23/18 08:22 PM
Chisel Tattoos.
by Silk
03/23/18 08:06 PM
Transmission stuttering on takeoff?
by zeke1985
03/23/18 07:40 PM
DIY Phone and tablet repairs ?
by Shannow
03/23/18 07:11 PM
Why do women despise other good looking women ?
by Mr Nice
03/23/18 07:09 PM
DIY catch can material?
by yugrus
03/23/18 07:06 PM
UAO Mobil1 AFE 0W20 2015 Malibu 4,995 miles
by gabriel9766
03/23/18 06:49 PM
Replacement Radiator
by Ndx
03/23/18 06:29 PM
Jump-N-Carry JNC318
by Trav
03/23/18 06:13 PM
Remote Transmission Filter
by Nick1994
03/23/18 06:07 PM
How do you like your steak cooked?
by ZZman
03/23/18 05:42 PM
Coolant Question - Can it degrade or go bad?
by maverickfhs
03/23/18 04:12 PM
2017 VW Jetta 1.4T 10K Mile Review
by FordBroncoVWJeta
03/23/18 04:04 PM
Valerie crashes at 343 mph but is OK
by MolaKule
03/23/18 03:51 PM
Newest Members
Nathan75, NXFan, Searay18, bobgafner, Billis59
64536 Registered Users
Who's Online
40 registered (aquariuscsm, bdcardinal, BigJakeChevy, 69GTX, Black, 91l98z28), 902 Guests and 97 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
64536 Members
68 Forums
280330 Topics
4679858 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Topic Options
#4474146 - 07/29/17 08:37 PM Exhaust hardware type...
NoNameJoe Offline

Registered: 06/03/15
Posts: 316
Loc: New York
Does anyone know what types of exhaust hardware are generally acceptable?

I know on some systems they use locking flange nuts. I don't know what warrants that. For example my Honda uses locking flange nuts, but it also uses spring bolts and has no flex joint, where as the car I am replacing this exhaust on does use a flex joint and no spring bolts. I'm assuming the spring bolts are replacements for flex joints since the engine will still torque the exhaust to some degree so there has to be movement somewhere.

I bought some stainless steel bolts that I plan to use with zinc-plated flange nuts I bought. The nuts are not locking and I didn't buy any lock washers either. I'm hoping to avoid galling and couldn't find stainless steel locking nuts to match anyway. Down the line the zinc-plated nuts will probably rust away before the stainless steel. I'm planning to copper anti-seize the whole setup.

Do the zinc and stainless steel work with each other galvanically?
Am I likely to experience problems by not having used locking nuts or washers?
Should I have bought flange bolts to match the flange nuts?

#4474176 - 07/29/17 09:31 PM Re: Exhaust hardware type... [Re: NoNameJoe]
OilSwag Offline

Registered: 07/02/17
Posts: 43
Loc: Tennessee
Well I only have experience in non salty conditions. I'm not in a snowy region and I'm not by the beach. So in a full exhaust I can use aluminized pipe for exhaust instead of stainless and not have issue like someone in New York or wherever. For an almost fool proof leak proof connection V band is the king in my opinion unless the whole exhaust is welded. I am not afan of flex joints at all. Until I bought my really used G35 did I ever have a car with flex joints. I had full exhaust on Mustangs and LT1 cars and a few 350s and various other cars without any issues. I do think a flex joints can help but it's going to be the weakest link in the exhaust. If your car is low to the ground and scrapes I can see the flex busting. I'm sure any hardware can last enough, obviously stainless is the way to go but not a must. I think a good diy exhaust coating is enough for hardware and weld seams. I live in Tennessee so don't have the salt issues but haven't had to cut anything off or torch anything either.
03 Infiniti G35 209K, Castrol Edge 5W30 topped with Edge HM, Fram Ultra Filter, Berryman/MMO fuel maintenance in 93 E0, all synthetic fluids

#4474214 - 07/29/17 10:13 PM Re: Exhaust hardware type... [Re: NoNameJoe]
andyd Offline

Registered: 09/25/04
Posts: 6749
Loc: Marshfield , MA
regular muffler clamps are grade 2 hardware. I use grade 2 5/16 coarse hardware on the flange connections between the cat and the resonator instead of OEM BMW stuff of a higher grade and way more 'spensive. Doesnt make any difference, they both rust solid. The OEM Boysen exhaust isn't life time mostly because my '88s were survivors long past the average age. I much rather deal with frozen grade 2 [censored] if I have to shear it or cut it. Exhaust hardware is one time use. I've sheared and then had to drill out a few stainless bolts. Its real slow work because fast speeds will burn an HSS bit. Even grade 8 is overkill except for studs. I use brass or copper nuts on exhaust manifold flanges down pipes. If you wanna put your money to good use, buy brass or copper nuts, not stainless. grin2
'16 Camry LE STP synth 0w20 and STP filter.

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline bulk 0w20 and ? filter

#4474233 - 07/29/17 10:49 PM Re: Exhaust hardware type... [Re: NoNameJoe]
JHZR2 Offline

Registered: 12/14/02
Posts: 41233
Loc: New Jersey
The only exhaust I've had to work on was my Mercedes and it has copper hardware.

#4474250 - 07/29/17 11:00 PM Re: Exhaust hardware type... [Re: NoNameJoe]
wrcsixeight Offline

Registered: 10/15/10
Posts: 1707
Loc: california

Edited by wrcsixeight (07/29/17 11:01 PM)
Edit Reason: delete, wrong thread
LA 318 Roller Cam
M1 0w-40
Fram ultra XG8A
Fram Ultra XG16 on remote transmission filter mount

#4474315 - 07/30/17 03:19 AM Re: Exhaust hardware type... [Re: NoNameJoe]
Olas Offline

Registered: 12/11/13
Posts: 3808
Loc: Manchester, England
Steel bolts and copper nuts will not stick to each other and will be relatively easy to undo.

That said, if the exhaust fits properly youll only fit and forget - stick it together with whatever fixings you have and in 5-8-10 years when it's time for a new exhaust just cut the old one off.

Also, flexi joints are only a band-aid for bad engine/gearbox mounts. Get decent mounts and ere is no requirement for a flexi.
Cable ties should hold it