I remember seeing a video on a cummins pyrometer install once where the guy turned on his engine before he started drilling to ensure that the manifold pressure would blow the shavings out the hole.

that being said, I would rather not take the risk and install one aft-turbo.

the 602.961 is no picknick to remove all that stuff so I want to avoid it.

at 298k miles, the original turbo is bound to go fairly soon (especially how I drive) so it may be worth doing a pre-turbo as well at that point.

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1992 850i 6 speed
1991 M3 S54B32 swap
2007 328iT/6 RWD sport wagon
1987 325E 330iZHP engine swap
2004 Vespa 200GT
1976 W115 240D getting a much bigger engine. 5.5L
1997 R129 SL600 5AT