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Meir
Just to put your mind at rest, I fitted a set of Chinese sourced headers (from Delubois Parts) onto my 2001 S. No other mods mechanically. The fitting went well, bolted strait on to the heads & secondary cats with no drama's. There is definately no loss in mid range, and the balanced length header pipes really come into their own at 4,000 rpm. In fact, as far as I am concerned there are no downsides apart from not being able to fit the rear plastic undertray.
One difference for you though is that here in Australia we don't have cats in the header - this may or may not have an impact on US cars.
The headers worked so well that I bought the cat delete test pipes from Delubois, and bolted them onto my stock rear muffler. This combo gives a really good sound above 4,000 rpm without the dreaded drone.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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Threaded Mode
