Extractors for BMW340i

[1UZFE Matt]

I have a scanner at last. Some photos from about 2 years ago!
Extractors I made using the original crown exhaust flanges.
They seem to work OK, I dynoed 216hp/161kw with stock crown ecu.
Regards
Matt.

Sorry if this is ment to be in the exhaust forum.

 

[SamB]

Nice work! do they work well??