Busa, I've got a thread going in the parts for sale of WTB Cat for THDP, have gotten a few replies. Brian at Gbodyparts.com carries them, but had to check the price for the length cat I need (I'm guessing you will need one that is around 13.25" from end to flange). Red Armstrong has them, but I haven't called to see how much. Johnsperformance.com has them, and they are $150.