You can try to see if you can see the spark plugs, if you can count them, should have one per cylinder. On my 2002 Camry when you open the hood all the way there is a little sticker that tells you the model number of the engine you can match it up with the owner's manual to find out.
Find a dealer with a 10 Camry and try to get the trade you want. The RAV4 sells well so I would think you can find what you want.
under the hood of a Toyota Camry
One can find more information about the Toyota Camry 2008 from the official website of Toyota. The automobile section of Yahoo also contains a lot of information about the Toyota Camry 2008.
Sales on a Toyota Camry can be found on websites such as Cars for Sale or Car Sales. You might want to call your local Toyota dealer or pop into their store and ask if Toyota Camry is on offer.
I'm trying to find the answer for that on a 1997 Toyota Camry.
Try ebay.com
You can find and exhaust system diagram for your 2003 Toyota Camry at most Toyota dealerships. Many local libraries will have Toyota service manuals with the exhaust system diagram.
booksforcars.com booksforcars.com
You can find it in the water outlet.
On ebay.com
In the fuel tank
here https://sites.google.com/site/autobestanswer/toyota