Very well done mate - I think you should be rightly proud of that one. Removing manifolds is not always a job for the fainted hearted but having a guide available will certainly make the job much, much easier for many and is a sound alternative given the cost of garage and replacement. Good work.
I think as you suggest, the minor loss of low end BHP or torque on a 5.2 V10 is going to be negligible, especially when offset against the cost and/or risk of a broken failing manifold.
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Current: 2004 D3 4.0 TDI V8 in Crystal Blue.
Factory: finger print, tv, xenons, keyless entry & go, soft close boot, 19s, and probably lots more besides
Done: fixed headlight washer leak, fit Bluetooth in place of factory phone
To do: DAB, DTV, fix soft close boot, get a spare key, investigate NSF bushes,
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