Hi guys!

I have a 997.1 with the Fister exhaust and X51 intake+TB and Plenum. I'm thinking on getting a 200 cell cat but want to hear your comments if you either of the two designs. I'm leaning towards the X Pipe, just because of look... but I want to hear about felt power/torque and sound. specially sound with PSE style mufflers...

tia!

joel

 

Interested as well.

 

There have been many discussions/arguments on this topic.

Some vendors will tell you the cross over pipes offer better flow design with the boxer 6 engines than the x pipe and offer more low end torque where it's needed most.

Others will say the x-pipe will give you deeper sound and more power is realized higher up in the rpm band.

I'm undecided which way I want to go on the 997 but I did experiment with both designs on my 993C4S and the XPipe Cats definitely sounded louder than the cross over pipes but I did not notice any additional power gains between the two.

 

The x-pipe configuration is supposed to draw the exhaust out by inducing the flow. In my opinion, this could reduce torque at low RPMs (where some level of back pressure is needed) and might improve torque and horsepower at high RPMs. The resistance to exhaust flow increases as the RPMs increase because the CFM of exhaust gases increase proportionately to the engine RPM. So inducing the exhaust flow is likely to be more beneficial (if it is at all) at higher RPMs.


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here's fabspeed's explanation of why they switched over to x-pipe cats:

http://youtu.be/hh-tYz_TxyA?t=2m

 

I tried x-pipe cat less and lost a tonne of low down torque and power. The noise was too loud and ricer too! Good power gains up top though!

 

I absolutely loved the sound of 200 cell cats with PSE on my Targa (which also had X51 headers but not intatke). The combo produced the best sounds, and with PSE allowed me to run more quietly when desired. In quiet mode, the cats came to life at higher revs, and in louder mode, it just got better!

 

I have the gundo hack with fabspeed 200 cell pipes. Check out my thread for sound. The cats make my car very quiet at rpms below 3500. Which is normal driving. After 3500 it's pretty loud. I'm planning on selling my cats soon.

 

Frankly I don't think you will be disapointed with either. I have the AWE 200 cell cats+fister exhaust and x51 headers and I get compliments all the time such as: "That's the best Porsche sound I've ever heard".