Given the legal hurdles you have to go through and the fact that your car is street driven, I'd stick with component changes like the Speed 3 Kit or something similar from other vendors. The differences between the subframe swap and component swap may be apparent but if you won't be utilizing the capabilities of the subframe, why go through the cost and hassle?
I'm in the same boat as you but mines based more on dreams versus reality of funding a build with full on changes that, ultimately, I might not even need to have in order to enjoy my car.
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Trey
Current ride: 2001 BMW 540iT soon to be manual swapped.
Former rides: 1979 Trans Am WS6: LT1/T56, Kore 3 C5/6 brakes, BMW 18in rims
00 BMW 540i/6: Suspension, wheels, and ACS bits.
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