Like Dan said above, You can have a cat welded in.
Here is what i suggest, i swear i write this every week:
Borla ProXS mufflers, Glasspack in place of resonator, Headers and buy a cat to get welded in its place.
SSAC and SD headers are $220 shipped to your front door, then buy a cat and have it welded in.
Or
SLP headers have the option to have a catted Downpipe but they are $750+ new.
Or
Just buy a catted Downpipe from Zzp if you dont plan on modding the car but those almost cost as much as SD/SSAC headers.
Now im sure your going to ask where you can buy SD/SSAC headers, before you ask, here you go:
SD Headers - http://www.ebay.com/itm/STAINLESS-SS...8dc2e4&vxp=mtr
SSAC Headers - http://www.ssautochrome.com/level.itml/icOid/1886
SLP Headers - http://www.3800performance.com/Merch...roduct_Count=0
ZZP Downpipe - http://shop.zzperformance.com/store/...Downpipes.aspx
