hi everyone.
i just separated the exhaust manifold at the bottom where it connects to the rest of the exhaust pipe. a lot of threads already exist with a lot of good information. rather then resurrecting an old thread i will just summarize some of the key points i read.
i still had the original studs, very much corroded, and to no surprise when removing the nuts i had a nice mix where two of them just sheared off the studs, one of the nuts actually came off and the last one stripped and had to be dremeled off. once i get them out of the car i will drill out the studs, which i read takes about 45min per stud and the cheapo drills are not up to the task but i'm still going to test that out.
when it comes time to reinstall, the studs will be replaced with the proper bolts and copper nuts (prices from ecs tuning):
11621427586, OE downpipe bolt, $13.20 each.
18301737774, OE hex nut, $1.40 each
the bolts used to cost $20 each, so at least they went down quite a bit. the reason they cost a lot is because they are made from inconel, which is a superalloy (yey), and very difficult to machine. the reason to pay up for these puppies is because the extreme heat they will be exposed to and allegedly SS can't properly handle the heat and will corrode, and may allegedly lose torque and possibly develop an exhaust leak, unless allegedly you are in a super awesome climate and you may get away with SS bolts.
the gaskets are $20 each (18107502346), OE certainly recommended here, they are one-time use so if you cheap out on the bolts you may just be paying an additional $40 anyways down the road, plus the proper bolts :)
one thing that is strange to me is the studs that hold the manifold in the head, which you would think are exposed to even more heat (11127506203) cost less than $2 a pop, so i doubt they are made of inconel.
to that extend if i can get some other bolts for the bottom that would be cool. i wouldn't care if they corrode and some day they will need to be cut off again, but i don't want them to stretch or lose grip of some kind.
on a side note i will be removing the top of the manifold soon and i can't let it happen that any stud sheers off because how could they possibly be drilled out... to this extend i'm using plenty of the 50/50 acetone and atf mix and letting it soak preferably for days.
i just separated the exhaust manifold at the bottom where it connects to the rest of the exhaust pipe. a lot of threads already exist with a lot of good information. rather then resurrecting an old thread i will just summarize some of the key points i read.
i still had the original studs, very much corroded, and to no surprise when removing the nuts i had a nice mix where two of them just sheared off the studs, one of the nuts actually came off and the last one stripped and had to be dremeled off. once i get them out of the car i will drill out the studs, which i read takes about 45min per stud and the cheapo drills are not up to the task but i'm still going to test that out.
when it comes time to reinstall, the studs will be replaced with the proper bolts and copper nuts (prices from ecs tuning):
11621427586, OE downpipe bolt, $13.20 each.
18301737774, OE hex nut, $1.40 each
the bolts used to cost $20 each, so at least they went down quite a bit. the reason they cost a lot is because they are made from inconel, which is a superalloy (yey), and very difficult to machine. the reason to pay up for these puppies is because the extreme heat they will be exposed to and allegedly SS can't properly handle the heat and will corrode, and may allegedly lose torque and possibly develop an exhaust leak, unless allegedly you are in a super awesome climate and you may get away with SS bolts.
the gaskets are $20 each (18107502346), OE certainly recommended here, they are one-time use so if you cheap out on the bolts you may just be paying an additional $40 anyways down the road, plus the proper bolts :)
one thing that is strange to me is the studs that hold the manifold in the head, which you would think are exposed to even more heat (11127506203) cost less than $2 a pop, so i doubt they are made of inconel.
to that extend if i can get some other bolts for the bottom that would be cool. i wouldn't care if they corrode and some day they will need to be cut off again, but i don't want them to stretch or lose grip of some kind.
on a side note i will be removing the top of the manifold soon and i can't let it happen that any stud sheers off because how could they possibly be drilled out... to this extend i'm using plenty of the 50/50 acetone and atf mix and letting it soak preferably for days.
downpipe exhaust bolts
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