[Johnny Danger]

Originally Posted by The Radium King

weight aside, the argument becomes where the remaining cats are located for best performance - on the headers or on the mid-pipes. porsche and cost say delete the cat on the headers.

changing mid-pipes is easier; no potential seized bolts in the block, no sensors to deal with. however, here are some links to three easy ways to fix the cel issue:

http://forums.evolutionm.net/evo-how-requests-questions-tips/215795-5-o2-cheater-non-fouler-how.html

http://www.fvd.de/us/en/Porsche-0/-/-/-/item/item_details/VID_33179399-VCD_85527367-gid_29-sort_4-display_50-item_FVD111LAMVER/EXHAUST_-_Tuning_-_Catalytics-FVD111LAMVER-Oxygen_Sensor_Extension.html

http://www.audiworld.com/tech/eng53.shtml

otherwise, everything i find on the intraweb says that the pre-cats are more restrictive than the main cats ...

Ideally, if one could eliminate the oem header/pre-cat design in favor of a set of high quality aftermarket headers that incorporated both larger diameter and longer equal length primaries that flowed into a well designed merge collector, along with a pair of high flow cats (something on the order of 200 cell tri-metal HJS or Emitec cats) that were located mid stream - that would prove to be a very effective system indeed. However, in order to accomplish something along these lines, one would have to spend big buck$$ ! Especially, with the cats . Having said that, unless a person's budget would allow for this kind of expenditure, the best option would be to remove and bypass the secondary cats. The 986 boxster shares the same secondaries as 996 platform vehicles. And, at 600 cells, these cats are much more restrictive (and heavier) than the pre-cats which are 400 cell .