FJ40 Mark/Downey Header (9 Viewers)

[gonzopancho]

Are you asking about the collector flange clamp (the articulated joint) or the slip joint between the midpipe and tailpipe?

V-bands are useful where you have mating flanges, which, by definition, allow only very low to no articulation. If the flange faces don't meet when using a V-band, you won't get a seal.

25 ft-lbs should be all you need, assuming you're asking about the collector flange.

 

[zerotreedelta]

Yes, the articulated joint. It's nice if you need articulation, but it's arguably less robust than alternative joints - trading flexibility for sealing in some regards.

Realistically, I don't need articulation there, and would wager most installing headers also don't given you're already into the world of custom exhaust...might be a nice future option to offer other joints there.

 

[zerotreedelta]

Dove back in - I think I found the culprit. The bolt was visually fine, so I suspect it was the nut, but the threads weren't meshing well and the binding causing an early/inaccurate torque. I replaced the bolt with fresh hardware, and it torqued up more as expected feel-wise. I did also add a whiff of sealant as well since it was apart and no real harm...but so far, seems quiet/snug.

 

[Fe3]

Dove back in - I think I found the culprit. The bolt was visually fine, so I suspect it was the nut, but the threads weren't meshing well and the binding causing an early/inaccurate torque. I replaced the bolt with fresh hardware, and it torqued up more as expected feel-wise. I did also add a whiff of sealant as well since it was apart and no real harm...but so far, seems quiet/snug.

That's great news.

These are stainless fasteners, so you do need to use the copper/high-temp anti-seize we provide to prevent the threads from galling.