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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 05-22-2012, 05:37 PM   #1
ColeD707
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ebay headers install on e46 325i

jsut installed ebay headers on my e46 325i and am getting a leak out of the gaskets that came with the headers. every DIY ive looked up says buy the OEM gaskets from dealer and use those, yet theres not enough holes in them to bolt up so not really sure what to do. What has everyone done to make these fit and not leak?? any help would be awesome. thanks!
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Old 05-22-2012, 06:48 PM   #2
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The Oem headers have 8 holes, new eBay ones have 12.
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Old 05-22-2012, 07:17 PM   #3
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You need to use OEM gasket, and make sure the bolts are torqued correctly
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Old 05-22-2012, 07:37 PM   #4
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jeez if you read everywhere that u need to use new bmw gaskets why don't you use it
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Old 05-22-2012, 07:55 PM   #5
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There also aren't enough studs in the head. Just use oem locations.
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Old 05-22-2012, 09:20 PM   #6
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I used oem gaskets and drilled out the extra holes, and installed more studs. I figure, it could use more clamping force, the headers are from China. No leaks in 8K miles. I've noticed some of the early heads don't have the extra holes machined in the head, if that is the case for you, I would just use oem gaskets and new nuts.
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Old 05-23-2012, 01:18 AM   #7
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I used oem gaskets and drilled out the extra holes, and installed more studs. I figure, it could use more clamping force, the headers are from China. No leaks in 8K miles. I've noticed some of the early heads don't have the extra holes machined in the head, if that is the case for you, I would just use oem gaskets and new nuts.

oem gaskets don't have all the holes cut out so they shouldn't be touched.
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Old 05-23-2012, 11:57 AM   #8
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There also aren't enough studs in the head. Just use oem locations.
Actually there are...
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Old 05-23-2012, 12:01 PM   #9
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Originally Posted by fastjasonbmw View Post
I used oem gaskets and drilled out the extra holes, and installed more studs. I figure, it could use more clamping force, the headers are from China. No leaks in 8K miles. I've noticed some of the early heads don't have the extra holes machined in the head, if that is the case for you, I would just use oem gaskets and new nuts.
That's what we were thinking. I'm the one that insalled the headers. Coles head has enough holes so we purchased the extra studs and installed them. It helped with the leak but it's still there.

Obviously BMW makes a gasket that will fit. His head has the 24 holes predrilled.

Do any other e46 models use different headers that use all 24 holes? Maybe a gasket set for an e36?
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Old 05-23-2012, 12:27 PM   #10
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I used the ebay gaskets. Make sure its tight enough and make sure the bunges are closed if your not using o2 sensors and if you are using them, make sure theyre in there good enough. Also, check for any leaks at the gasket where the headers meet the exhaust.

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Old 05-23-2012, 01:13 PM   #11
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I used the ebay gaskets. Make sure its tight enough and make sure the bunges are closed if your not using o2 sensors and if you are using them, make sure theyre in there good enough. Also, check for any leaks at the gasket where the headers meet the exhaust.

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Honestly, the eBay gasket would have worked if we had installed all 24 at once. But since I only had the 16 from the old headers it didn't get them tight enough. The eBay gasket ended up separating. The only reason we reused it was to get the car drivable. The only isse we have now is gaskets.

The o2 sensors are in, the plugs where we didn't use sensors are tight. We even used new gaskets for the header to midpipe connection.
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Old 05-23-2012, 01:18 PM   #12
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You just answered your own question. Go to bmw and get new bolts and, if needed, threaded shafts and reinstall the headers basically. Your probably going to need new gaskets if there are any rips. When i did my headers, i think i missed like 3 bolts because i couldnt reach them and mine seems fine.
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Old 05-23-2012, 02:52 PM   #13
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I think you're right

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Actually there are...
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Old 05-23-2012, 04:50 PM   #14
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I think you're right
I actually didnt notice at first. Its kind of weird that they would have extra holes. That's why I'm trying to find the gaskets that would fit. Maybe the european cars had different headers that used all the holes or something.
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