all parts you might not see on the first sight, look original, are OEM or woulnd´t have any negative influence on exhaust gases, loudness, idle run, chassis stability and safety might not be the problem.
for regular tuv-approval you might need the approval papers, e.g. material oder process related.
for example rhd-speedmaster are known to bring k20 civics on the streets. have you heard of them?
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