cvazquez

My Boxster has the Power Agency Exhaust system which eliminate the secondary Cats. I'm thinking of purchasing a Cat-less header system which will eliminate the primary Cats. I was told that the back pressure will be eliminated and the low-end torque would suffer unless I'm up on the REVS. Has anyone here eliminated the Primary and Secondary Cats, if so, what are your impressions and recommendations?

Thanks!

ScorpionT

Backpressure does not give torque, so whomever gave you the information was incorrect. The loss of torque is a side effect of using too large a diameter tube for the headers. Proper tube size for the application will give both horsepower and torque gains.

kiesan

My 05 987 with an 07 cs 3.4 is running b&b catless headers/exh.

It has torque everywhere, from idle to redline.

cvazquez

Did you retain the secondary Cats or are you completely Catless?

kiesan