As at us in Germany any changes from OEM to custom parts, especially in the technical area, will have to be approved by the authorities, it is useful to mount something that looks like OEM. If modifications do not attract direct attention to them, it sometimes works. Otherwise you will have a lot of charges for official technical approval. That´s why I´m interested in these TTS headers, but only if they have a positive effect on my newly built engine with 10.5:1 pistons and new cams. If it makes absolutely no sense in terms of supporting my basic modifications, I would like to renounce it.
Georg