|
the reason i noted the part number is, if you go to the USA PET, it is for a 2.7/3.2 L boxster w/ cats (the 2.5 L has a different part number). any USA exhaust made 97 to 99 would not have cats but be for a 2.5 L. so, the assumption is that porsche used the same part # for headers with and w/o cats, and just issued the appropriate part by region.
knowing for a fact the uk and aus 2.7/3.2 L boxsters do not have cats on the headers (these are preheat cats required to meet USA emmissions) one can assume porsche felt the best performance was achieved by locating the remaining cat on the mid pipes. so, if one were looking for the best performance mod, it would be to use catless headers and not catless midpipes (and complete catlessness appears to kill low rpm torque). there are those cheap ebay headers out there, but welds, steel quality and flanges have been questioned, and the size of the primaries is a bit large, resulting in decreased low rpm performance. as an option to $2000 headers, i was thinking of row headers instead.
|
Threaded Mode
