Thanks for the info Jim. One of the 100-cell cats I have on my Boxster looks like it is bad, so I was originally thinking of replacing it with the very pricey TTP high-flow cats to match my TTP headers.
Now, I am considering the Janspeed, which look like they are cheaper if I can find a good source for it. I may even try the muffler system that they list with it (
http://www.easier.com/view/News/Motoring/Porsche/article-92247.html), I will keep you posted. Does anyone know a good source for the Janspeed products, it looks like there are no distributers in the US, thanks,
Ed