pologuy

Anyone know if Boxsters have high flow catalytic converters?

boxhead

I believe they are 300 cell units.

R2R

Fab Speed has 200 CPSI Sportcats for the 986 & 987.

Macster

to all the trouble to develop a high output engine only to undo that with lousy converters.

However, if you've mod'd the engine to flow more air higher flow converters -- higher than stock that is -- would probably be a good idea.

Not all after market high flow converters are made equal, that I know. But I have no recommendations.

Sincerely,

Macster.

nickg

hi flow cat = check engine light p0420

GVA-SFO

Strange that this topic stay silent (!!!
I would be very interested to know if some of you are running with high flow cat, (on the primary) ..and same question on the secondary !
How is the enhancement ??

provoste

Not here... NHP 200 cell primary cats and secondary bypass pipes. Installed 1 year ago with original O2 sensor, never any CEL. Oh- and my car is a '03 S.


As I mentioned above, I'm running 200 cell primary cats and secondary bypass pipes into a GHL muffler. It is much louder, but sounds amazing... Very exotic. Performance-wise, significantly better across the rev-range, most notably in the midrange.... About 3k to 6k.

John@Fabspeed

Not true. This only applies if you use low quality cats that seem so much cheaper than Fabspeed's or other competitors. The HJS 200 Cell cats that Fabspeed uses will not trigger a CEL and sound absolutely great. They are as durable, efficient and high flow as you can get while maintaining a working cat.