Bought a pair of headers from GMG and had them installed on my turbo.
Have not seen any posts on GMG headers that I could find.
These are a thing of beauty, had them on my desk for a day
and every one who came by my desk commented on the welds.

For some reason most of them thought the welds were done by a women.
Is this true Fabryce?

Anyone in the market for headers should put GMG headers on the list

 

What are your impressions about lag/hp?

 

No increase in lag, if at all may be decrease in lag as I had Champion VTG Turbo(Gen1) turbos installed at the same time.

This may be due to the billet compressor wheel being lighter and bigger causing the boot to build more quickly.

Increase in HP due to headers I am not able to quantify.
I had follwing done to my car at same time

Cargraphic Race Exhaust (Cat-less)
Champion VTG Turbos (Gen1)
Werks1 Inter-coolers

 

Yes,usually a well designed set of headers minimizes lag especialy with larger turbos...That is why i asked for your impressions...It would be interested if you had any 20-100miles times with 4th gear only to see header differences...My previous 996TT had headers and there was a difference with the lerger turbos I had...