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Old 02-01-2008, 01:17 PM   #1
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Do I need to change the exhaust manafold bolts with new headers?

The subject says it all. Getting the bolt seems to be troublesome unless I want to wait two weeks for delivery.

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Old 02-01-2008, 01:33 PM   #2
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Nope you shouldnt need to replace the manifold bolts, only the gaskets.
--Proud Boxster Owner/Tech,

Carlos J Cazares

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Old 02-01-2008, 06:02 PM   #3
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You should get under there and take a look at your headers and the bolts. When I replaced my headers I also replaced the bolts because they were rusted pretty bad. With any luck yours might be in better shape.
The OEM bolts are M8x1.25x28 which is not a readily available size. The 28 is the length in millimeters. The eBay headers I bought had a thicker flange than the stock ones so I went to an auto parts store and bought 12 M8x1.25x30 bolts for about a dollar each. The local Porsche dealer wanted $3 each.

If you are replacing your headers in the near future, good luck. I had a hell of a time getting the header/catalytic converter flange bolts off. The rusted header bolts turned out to be the easy part.

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Old 02-02-2008, 03:53 AM   #4
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You guys are the best, thanks. I bought the exhaust and headers from Maxspeed Motorsports so maybe the longer bolts will be needed. I took a look and they are pretty rusted so I'm going to have to replace those along with any other rusted bolts.

I should supply the neighborhood with earplugs for the amount of cursing that will go on while I fight with it.

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Old 02-02-2008, 04:45 AM   #5
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Spray the bolts liberally with some of that stuff in a can that loosens rusty bolts up so well and let it sit overnight before you tackle it. That's what my mechanic did on my car when he did a header replacement.

Sorry, but I can't remember the name of the stuff for the life of me right now!
'97 Boxster (Black Hole for 42,000 Dead Presidents and counting) - 122k
New motor, transmission, suspension, and on and on and on it goes...
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Old 02-02-2008, 06:15 AM   #6
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PB Blaster

Liquid Wrench

two popular penetrating oils/sprays.

Jeff Wilson

1989 911 Cabriolet
Grand Prix White/Black

Stock except:
Turbo 7x9 Fuchs

2002 986S
Seal Gray/Black
Painted Center Console
18" Turbo Twists with rear spacers
Tequipment aluminum shift knob
Colored center caps
De-ambered tail lights/side markers

Stock except:
B&B catback exhaust

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