the quality of the hamann crap is pretty horrible not to mention that their gains are pretty negligible. Wheelpower will probably not going to be able to get you the header either. Contact Discovery Auto. the owner goes by Shadowman on the m5board and can custom weld you some headers and tune them to your SC'ed application if you are serious. He is very expensive though.
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Originally Posted by Daddy_Warbucks
I foung two leads for headers today actually spawned from discussions in this group. I contacted G-power in Germany (at least emailed them... ) but have no reply as of yet.
The other firm that actually has a part number of their website is Hamann-Motorsport.com (again...taken from suggestions in this thread...and they do have a US dealer out in CA... Wheelpower.com). They have different part numbers for the 4.4/4.6 and for the 4.8. I asked for a price quote including shipping for the ones that fit my ride... lets see what they have to say. Hamann has a big collection of "body enhancement parts" offered. Some are very cool... you should check them out. They also offer, get this... "replacement engines". They are bigger displacement... and not enough technical info about them to know if they are strokers or big bores.
I'll post the info about the intercooler sometime later tonight. 
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