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#31
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2012 xDrive35d 2001 BMW X5 3.0i 5MT and two 1987 Corvettes - Callaway Twin Turbo and Guldstrand Grand Sport 80 Block Tester |
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#32
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No, the factory manifolds do not use all 24 stud holes.
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2001 E53 3.0 5pd |
#33
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The stock manifolds only have 16 studs/nuts attaching them while headers have holes for all 24 (4 per cylinder). There shouldn't be any 'junk' in the unused holes as they would have been covered up by the original manifold/gasket. Maybe blow a little shop air in them just in case?
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2012 xDrive35d 2001 BMW X5 3.0i 5MT and two 1987 Corvettes - Callaway Twin Turbo and Guldstrand Grand Sport 80 Block Tester |
#34
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#35
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2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles) |
#36
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Everything eventually bolt up? I am a few weeks away from doing this. I am going to stick with stock cats as I don't want to deal with the mods around headers again and the smell. When you are bolting the studs back in with the 2 nut combo and backing it back off, do you actually have the room to work with the wrench doing this? Curious if you had more tips around this since you probably completed it. |
#37
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Everything bolted up perfectly, and I'm enjoying about 10% better mpg and what feels about the same increase in power.
It is tight in there, but I found room to use the 2 wrench/nut combo when screwing the studs back in. I used a combination wrench and a 1/4 ratchet with shallow and deep sockets depending on where I was working. Also, some were easier to get at from the top while others were easier to reach from underneath. One other key is to buy two regular (non-locking) M7 nuts to screw the studs in. That way, when the stud is in, you can back one nut off slightly and unscrew both with your fingers.
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2012 xDrive35d 2001 BMW X5 3.0i 5MT and two 1987 Corvettes - Callaway Twin Turbo and Guldstrand Grand Sport 80 Block Tester |
#38
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I got mine bolted to the head, but I'm still vband flanging my new cats to the end of my headers. If I can't figure out a good way to get from the cats to the stock x pipe, I might have to cut that out as well and put in a borla.
I figured out something interesting...no E53 exhaust manifold gasket has 12 holes per gasket in it. That means if you want to put OEM gaskets on headers for the sleeper look, you would have to drill press the gaskets carefully. Also, the gaskets that come with ebay headers look suspect, so you can use E36 328i gaskets, which are MLS gaskets with all 24 holes. No heat shields though. If you wanted to (I thought about this but did not have the patience) you could chop down the OEM E53 gaskets and mount them outside the headers. Getting the nuts on with the heat shields on is terrible, though, if anyone is wondering.
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2001 E53 3.0 5pd |
#39
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Do you have data to back that up? Nothing about intake and exhaust mods should ever change MPG in gasoline engines. Power yes, mpg no. That's not absolutely always the case, but it's so rare that I'm always skeptical unless there are fuel logs showing it to be the case. (Not dash readings)
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2003 3.0 5MT Topasblau Purchased in 2016 and surprisingly still running |
#40
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Less restriction will give you less power loss means more power to the ground vs heat loss. This will mean better mpg but 10% not likely at all. If that was possible all the X5 would have high mpg headers.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
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