Quick exhuast question

[Hamburgers]

Are the studs that connect the exhaust manifold to the downpipe the same studs that connect the manifold to the head? I haven't been able to find "down pipe studs" anywhere on the internet, and figured it's because they're the same as head studs.

[JohnN]

http://www.realoem.com/bmw/showparts.do?model=ST12&mospid=47140&btnr=18_0334&hg=18&fg=05

The part # is: 07-11-9-913-676

M8 x 35 stud

Regards,

John N

[4x2]

Downpipe studs are M10x25

Stud bolt M10X25 | 3x | 071-199-091-17

On Realoem

Manifold studs are M8x40 or so.

[tjones02]

07 11 9 909 117 is 10x1.5 thread 25mm long and the original '02 #

11 62 1 711 671 are 35mm....

11 62 1 716 870 are 40mm...

I like the 35mm ones.....

Also only use the copper exhaust nuts... I like the 15mm wrench size pinch ones rather than the cheap 14mm head ones. # 18 30 1 737 774

http://www.autohausaz.com/search/product.aspx?sid=forr1k55jnlpav20cyqwql55&partnumber=18301737774

The cheap ones can bind and strip threads when removed!

Oh, and use good copper anti seize on all exhaust threads!

[JohnN]

the fastener between the downpipe and the exhaust pipe. I should have caught on when the description was a bolt, not a stud.

Thanks for setting things straight.

John N

[Hamburgers]

Wow, thanks for the replies everybody! That exhaust leak is looking at its final days.

[tjones02]

Ah, I have also seen warped downpipe flanges that will not seal up no mater how many times one replaces the gasket and nuts.....

I suggest placing a straight edge on said flange once off to check for flatness. If not flat..... easiest way to fix it is to replace it.