Exhaust manifold studs pros and con questions....

[blue62]

Originally Posted by Johnny5

I just got done drilling out 4 broken studs on bank 1 which snapped on me. Was curious has anyone done a stud conversion on these? Or would you recommend factory or hardware store grade with anti seize?

I would go studs with brass nuts.
The only issue I have ever had with that setup is that sometimes the brass nuts loosen up.
But checking them once or twice a year is the answer to that issue.
Studs and nuts on exhaust is way better in my opinion then bolts.

If you use studs with brass nuts even if the studs rust the softer brass nut releases without to much problem.

[Johnny5]

Originally Posted by blue62

I would go studs with brass nuts.
The only issue I have ever had with that setup is that sometimes the brass nuts loosen up.
But checking them once or twice a year is the answer to that issue.
Studs and nuts on exhaust is way better in my opinion then bolts.

If you use studs with brass nuts even if the studs rust the softer brass nut releases without to much problem.

Thanks for the response. What material studs? Stainless?

Also where’s a good place to source these?

[blue62]

Originally Posted by Johnny5

Thanks for the response. What material studs? Stainless?

Also where’s a good place to source these?

Lots of people say stainless for exhaust but that is a mistake in my opinion.
Stainless is very hard if you brake one off ( and it does happen with stainless)they are hell to drill out.
So I use a soft material such as grade 4. Then If I have to drill it out it drills easy.

I have found common exhaust studs ( the type that are threaded on both ends) at Ace Hardware.
You will have to check to see if they are Metric so they fix the Porsche.
Napa auto parts. would be another source.

Brass nuts can be a little harder to find but Napa should be able to help.

[Johnny5]

Originally Posted by blue62

Lots of people say stainless for exhaust but that is a mistake in my opinion.
Stainless is very hard if you brake one off ( and it does happen with stainless)they are hell to drill out.
So I use a soft material such as grade 4. Then If I have to drill it out it drills easy.

I have found common exhaust studs ( the type that are threaded on both ends) at Ace Hardware.
You will have to check to see if they are Metric so they fix the Porsche.
Napa auto parts. would be another source.

Brass nuts can be a little harder to find but Napa should be able to help.

Thank you. Will visit Ace tomorrow as they are closing early today.

[Dave80GTSi]

Originally Posted by Johnny5

Thanks for the response. What material studs? Stainless?

Also where’s a good place to source these?

No reason to over-think this. I simply went to my local hardware store, bought a dozen M8 ( ... I think, thread size from memory) plain old carbon steel long full thread bolts, and Dremel'd their heads off so to give me full threaded studs.

I then used SS nuts with high temp anti-seize on the threads.

Simple.

[Johnny5]

Originally Posted by Dave80GTSi

No reason to over-think this. I simply went to my local hardware store, bought a dozen M8 ( ... I think, thread size from memory) plain old carbon steel long full thread bolts, and Dremel'd their heads off so to give me full threaded studs.

I then used SS nuts with high temp anti-seize on the threads.

Simple.

Looks good. Reason why I wanted to ask is that some forums had a big debate on studs vs factory so was curious. I have studs with copper nuts on my M3 and they’ve been great.

I do like that option as well if I can’t find the double end exhaust studs to just go with full threaded and cut the heads and retap the end. Will see what I can find tomorrow.

Thanks for the reply and suggestion