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$500 for just the headers, $2000 for the whole setup. I'm sure custom headers alone would be far more than buying a used M5 setup and just adapting the water feed lines. Turbo moding companies have said that after their upgrades, there's no differences between the two turbos, but in the bigger picture, upgrading the headers, even with minimal gains, would probably still help.
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'10 BMW X5///M - Alpine White on Sakhir Orange - JB4 w/ HCP Stage 2 BEF, NGK 97506 @ .20, SS tubing & BMC filters, gutted cats, AC Forged 312 22's, H&R 2"
'98 BMW 740iL - ///E39 M5 6spd swap, fully built engine (sleeved, P&P, cams), 3.46 LSD, H&R Stage 2/Bilstein HD, Magnaflow 14816's
'97 BMW 328ci - ///E36 M3 clutch & L/W flywheel, Z4///M 18's
Last edited by m5james; 10-06-2015 at 12:26 AM..
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