Mad Dog Headers

Those PerfWeld headers are expensive... But we're talking about max effort race headers and comparing them to off the shelf street headers.There is a big difference there.
Yes, you can't justify them on a $5000 street beater (or even $10K or more), but on a big dollar race car, hell yeah.
If you really want to knock your socks off, look at the price of the leading bike headers out there nowadays, there are plenty of $2000+ exhaust systems for 3 and 4 cylinder bikes. And I see $10,000 dollar bikes running around with them!
Look at Akrapovic, Arrow and LeoVince.