Is there one? The braingears stuff didn't mention one. I'm concerned because I'm aware that this intake is aluminum, and I do not want to warp it. Do I just go down the line and tighten? Do I tighten randomly? Help!

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1987 300D wvo on the way!

pulled mine off a couple of times and no specific tightening pattern. Works fine and you don't need to have the bolts ultrasnug (25 Nm is not a lot). It seals fine with no leaks.

It's not like the cam or the head where you need to even out pressure due to competing forces (e.g. springs putting pressure on certain cam lobes which will put pressure on the shaft).

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1982 300TD 210K miles ("The Replacement" aka "The Anvil") - SOLD
1979 300SD 245K miles (never ending project)
2007 Pinarello F3:13
1995 Ducati 916 (SOLD, sniff)
1999 Ducati 900SSie (SOLD)