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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 09-25-2006, 01:06 AM   #1 (permalink)
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bored out exhaust manifold

upon taking off the exhaust manifold, it wasn't really oval like there supposed to be in a perfect world. So i dremeled the surroundings as until it was all oval, took over 3 hours for all of them. I haven't had a chance to drive my car yet, but are there any performance gains from this? Thanx.
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Old 10-16-2006, 01:00 AM   #2 (permalink)
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Old 10-16-2006, 04:50 AM   #3 (permalink)
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Not sure about our cars, but matching the head ports to the exhaust gasket and header to exhaust gasket does gain a little in the old-school V-8 world (i.e. my 72 Chevelle). You have to go back in the head a little to make it work, so it has a smooth transition from the shape of the exhaust port to the gasket and back out to the manifold. I hope you stuffed rags in the head to keep the metal shavings out of the motor.
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