I added the Fabspeed 200 cell x-pipe and noticed a decrease in sound of the PSE as Joel mentioned. However, when I added the Fabspeed headers, it gave me the more aggressive sound that I was looking for.

 

Sorry...did I miss it...what year is your car??

My 09 S has the Fabspeed X pipe and PSE and it's plenty loud for street IMO. It really howls and sounds absolutely bad a$$ at 4000 rpm or so. Not sure what you're going for but mine is on the edge of being annoying (to others) but it has a very exotic sound. I've not heard any other 997 sound like mine yet. Rev match a down shift under a bridge or in a tunnel and if it doesn't raise the hair on your arms...you're not alive! :-)

 

My car is an '07 S

 

My experience was exactly the same, great combo. I don't know what effect the X pipe has on this setup.

 

I have a 2008 997.1 with factory fitted X51 6-Speed and my exhaust set-up is AWE Headers, IPE X-Pipe w/200 cell and PSE. Sounds absolutely amazing. I like it a lot....sounds great.

 

My car sounds amazing at 1600 RPMS LOL!
If you shift like me (at 5500 RPMs) you are in for an orgasmic experience

 

Any thoughts on the FVD 200 cell cats?

Specifically these: http://www.fvd.de/us/en/Porsche-0/99..._U-Design.html

I dont want to lose any power/torque in the lower rev ranges.

Any comments would be appreciated.

Thanks!