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Originally Posted by bmwm750
I can't speak for the rest of the exhaust, but those headers look like very little thought went into them and certainly would appear to flow very poorly.
Patrick
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Well they are a 3-into-1 design so you will get more top end speed as apposed to a 3-2-1 design for more torque. Either way, the fact that the Cats are now "built in" making them legal and the piping which is 2" tells me they would flow much better than stock 1-3/4". The cats are also high flow. All the other headers out there only have 1 set of O2 censors on them making 01-04 owners having to add another set to the headers or relocating the extra set to the down pipe section. Both of which would require welding in new bung holes. Unless of course you have an earlier 97-00 Boxster which does not require a second set of censors. I just like the fact that they are better than stock and still street legal not setting of error codes and whatnot.
42mm primary piping vs. 36mm stock piping
200 cells sport catalytic converters
2 inch exit pipe vs. 1 3/4" stock exit pipe
10mm thick flanges
T-304 Polished Stainless Steel (except for flanges they are steel)