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      02-29-2012, 04:04 PM   #17
Rboosted717
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Drives: 2010 X5M
Join Date: Mar 2011
Location: Bay Area

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F10 M5 exhaust manifold part numbers:
11627843780 (cly 1,4,6,7) 949.21EUR ($1267USD)
11627843781 (cly 2,3,5,8) 949.21EUR ($1267USD)

Total Cost $2,534USD (1898.42EUR) + fee's, customs, taxes, shipping. Expect to pay around $3,000 after everything is said and done.
(I've seen some places want as much as $3346 just for the pair of manifolds)

You'll also need two gaskets (goes between the clyinder head and the manifold). Costs $71.84 for the pair (part # is 11627589106)

You'll also need two gaskets (goes between the manifold and the turbo's). Costs $21 for the pair (part # is 11657845076)

I also suggest replacing the gaskets for the connection between the turbo and downpipes, and the bolts for the exhaust manifold depending on the age/condition.

In terms of time, expect to spend 4-5hrs to do the exhaust manifold (just doing the downpipes takes a minimum of 3hrs). You'll also need basic tools, though you'll need an assortment of torx (or 8pt sockets) and hex sockets for a majority of the bolts. Its also a great time to either swap the turbo's and/or downpipes given you'll spend a minimum of 3-4hrs doing either modification in the future.

Have fun and enjoy the power. The spool up and top-end should feel improved, though won't be as dramatic unless you remove the catalysts and retune the maps.

If you want to modify the stock turbo's I suggest contacting Precision Turbo and they can offer a quote for custom (enlarged) billet compressor wheels and enlarged turbine housings or better flowing turbine wheels. It all depends if you want more top end power, mid-range power, or low-end power. I'd suggest going with a 2-4mm increase in the compressor wheel and increasing the a/r on the turbine housing by .20 for a decent improvement without going too wild. The cost should be reasonable, around $2-4k depending on what you ask for. The only limitation is you will need to either modify your factory turbo's or buy new versions to modify which will add an extra ~$4,800 to the bill.
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