kevin wrote:Michael, to weld a nut on the manifold is a big NO NO unless the thread is stripped and then you dont even weld it, just hold the nut from the top. With the headers still on screw a stud in with your fingers.
These headers don't have tapped 8mm holes for studs - they are more like ~9mm so I would need to use bolts.
I do have some 8mm Helicoils - I could use those instead of welding the nuts on I guess.
I actually got the idea of welding nuts on the backs of the flanges from my 12v CSC headers.
kevin wrote:I think 57mm is to big. I am getting results with 50mm on the 3.0 and 3.2. I got 57mm on the 3.7.
Do you use 50 mm Inner diameter or Outer Diameter pipe?
The flanges seem to be made for ~56mm OD pipe. I could get the Exhaust shop to taper the pipe gradually down to 50mm if that would result in a performance benefit.
![flange_diameter.jpg](./download/file.php?id=6381&sid=1d730ce3550f102d7d9a1e8b74c914c8)
- flange_diameter.jpg (86.49 KiB) Viewed 6200 times
kevin wrote:A well made 63mm last section from centre to over caliper will work well.
Check niclas racing 75 also 50mm first section.
Yes - but will a thinner diameter, dual system work better?