I am Teh Edumacator.
Join Date: May 2005
Location: ATL, London, and Barcelona
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If you have a supercharged V8 at around 6psi, it'll add around 50 hp.
You won't get the kind of results out of headers on a BMW engine that you would on, say, an LS1 or similar American muscle. In addition, headers for a BMW engine are usually rather pricey. Dinan headers for the V8 are over $10K. Supersprint are more reasonable, but have a reputation for cracking.
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1999 E39 540i/6-VF Stage 1 S/C, Dinan exhaust, Dinan strut+shock braces, Dinan ltwt flywheel + clutch, Dinan Brembo BBK, Dinan monoball, H&R Springs, Koni Yellows, M5 sways, Dinan forged 18" wheels, &c.
1995 E38 740i. Highly modded. Faster than you.
Sold 2-28-07: 1997 E36 M3/4, 8-30-05 RIP 1997 528i
Lindsay fan club member.