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Originally Posted by ekam
O.....kay.
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This is an excerpt from Instant- G's web site
Instant-G Stainless Boxster 3.2/3.4 Headers.
The stock Boxster uses 1-3/8" tubing. The Boxster "S" exhaust is a joke and actually necks down to less than a square inch before the catalyst.. Porsche had to figure out some way to get rid of 32 HP!
Here's the deal.
The 996 makes 300 HP at 3.4 ltrs. 88 HP per liter.
The Boxster "S" makes 250 HP at 3.2 ltr. 78 HP per liter.
It doesn't take a rocket scientist to show that if you can get 996 power out of a Boxster "S" you'd gain 32 HP.
Now the kicker - these headers with no change to the cat or muffler same dimensions but built for a 996 make 318-320 HP with no mods to the DME. (94 HP/liter)
That means that you should be able to get 300 HP out of a Boxster "S".
It ain't rocket science. Well, maybe the headers are but the logic isn't!
NOTE: We sell this as a complete solution, from header through cat and INCLUDING muffler and your choice of tips. Porsche uses 1-5/8" tubing as primaries, we use 2-1/4. That is 80% more crossectional area.
When I spoke with the gentleman, he indicated that his exhaust components use larger diameter size flanges, piping and joinery through out. In addition, the design of the merge collector and the length of the primaries on his headers were altogether different from any oem or aftermarket system. Therefore, his headers, cats and cat back muffler will not "tie" into either the factory system or an aftermarket one that has the same size diameter as the oem.