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Original von NSXEatr
Thanks for replying to my inquries.
I'm back home for Christmas in California. While I'm here, I'd like to bring back a few parts with the help of a friend from S2KI. California has the strictest laws in the US. But I bet German motor vehicle laws are more stringent. So I'm curious to know if my vehicle requires an emissions test for the TÜV inspection. If so, will anything like an AEM fuel management & reflashed ECU meet German standards?
a stock s2k is legal in Germany, even if its a 2.2, it will pass emission test.
AEM management not sure since the use the OBD port while emission testing
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Will replacing my OEM steering wheel with a Momo setting wheel be TÜV complaint? Upgrade cross drilled brakes? JDM Bride driver seat? Voltex wing? ADVAN A048? Having summer tires in winter? Almost always summer here in LA! 
Except of the Advan (in correct sizes) you cannot change anything unless it has TUV approval which most parts dont have.
there is one or 2 manufacturers which sell cross drilled with TUV approval.
Summer Tyres in winter is not allowed.
Bride seat woudl evetually pass if mounted correctly
Momo wheel is not allowed sinc eit has no Airbag
Voltex wing cannot be mounted for street driving
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So basically, I just want to know what's the general rule for replacing factory parts. Forgive me if my questions seem irrelevant but I just want to make sure I comply with local vehicular laws.
One more thing, where can I find the nearest Honda/Japanese Import tuner shop around München, Nürnberg or Mannheim?
again general rule is every part has to have TUV approval
There is no good S2000 tuner in germany to my knowledge
If you work for the Army you could be exempt from these rules