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mg_zt
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Confused a little but the fitment that will fit the 48mm throttle body will also fit the 52mm, the 52mm refers to how large the flap is inside the body the outside body as it where is identical, Hope that helps,
 

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The external diameter to all K4 16v throttle bodies is 70mm. This is regardless of the internal diameter (48 or 52).
 
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