Does it make $1000 worth of more power? No.
The prices of exhausts are obviously set by their manufacturer for reasons unbeknownst to us. Perhaps it's due to exotic materials (titanium is difficult to machine and work with). However, more likely it's a number they've decided reflects their company name, product availability, exclusivity, etc. Do you think these JDM exhausts cost anywhere near $5000-6000 to produce? The size of the consumer market is also an issue. If you're selling a custom-made product to a handful of people, you'll have to charge more to get your investment back. Hence why a GTR exhaust costs, on average, more than a 370Z exhaust.
If you want exclusivity, pay more for an exhaust. However, there are very high quality exhausts for well under $2000 (See the Fast Intentions exhaust). Then there is the run-of-the-mill consumer aftermarket bracket in the $1,000-$1,200 range that includes very nice appearing, durable, power-producing exhausts on a reasonable budget.
Don't think that paying through the nose is going to get you double the horsepower gains though. You'll be woefully disappointed.
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2013 Cadillac V-Wagon, RIP Z
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