these aren't new parts, but it's the largest auto stripper in the USA:
if it's not listed just email them for a quote.
http://www.lkqcorp.com/location/fulfill.asp?Exe=1
go to your state and find an local outlet, then do the parts search.
4T65E trannys $200-350
3.5L Engines $500?
Shipping is OK also because they will ship freight to one of their local outlets. So to ship a tranny may be $40-$50, but then you got to pick it up.
Better put that car on a lift or jacks and find out where the sound is coming from before you buy anything. Don't waste anymore money than you have to. The Intrigue exhaust is pretty good stock in my opinion.
You can always wait for the parts to show up on Ebay also.