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Dave
Are you saying that if the engine is not standard or has non-standard parts that affect emissions that a full emisions test is needed?
If so, this has been the case for quite a while.
Using a standard engine with the accessories and parts from an unmodified donor car, particularly the computer, allows you to claim compliance on the basis that the donor car has already been through that for its engine, including meeting full emissions testing.
About the only mod. that's allowed that I am aware of is use of other air filters over the standard air box. This again is provided all emissions management gear is still retained in the system.
At testing then just an idle emissions test is undertaken as much as anything I guess to provide some proof vehicle's engine is close to standard as being claimed.
Cheers
Steve
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slowy
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