Re: Option XLF
Exciter,
This is broad subject. it is like your home stero speakers. Some people like the sound of pair of JBLs some like the Infiniti and so forth...
As far as other after market exhaust systems, I have heard RUF on a Turbo and it sounds very nice. On a regular 911 though XLF sounds very good for the money but again that would be your choice. You may happened to like the TechArt exhaust Vs. XLF.
Probably the best bet would be checking the manufacturer s' web site for sound clips or contacting them to see if they would email it to you.
As on the XLF option, I'm sure you can visit your local Porsche dealership to see if they have this option on any of the cars in their lot so you can hear it in person.