What part of Oregon, I'm on the Oregon coast.
If you are around Florence I would take it to Muffler Works or Tony's Garage. Only two places I will let work on my cars on the coast. If you make up up to Vancouver Wong's would be the man or up by you in Seattle Ellis with Speed Secrets is the place to go.
1998 Camaro Z-28 ~ 2004 Silverodo ~ 2008 Pontiac G8 GT
Tuned by TJ Wong Wong's Performance Engineering