Hello,Thanks for shopping the Crutchfield web site. I'm Niles, and I'm glad to help. In answer to your question about adding a new receiver to your 2003 Subaru Outback with the McIntosh audio system, the first thing you need to know is that the wiring harness adapter we have for aftermarket receivers will not cover the speaker wire connections. The factory amp cannot be simply integrated to the system, as you have to run speaker wire from the outputs on a new receiver directly to the speaker locations. And, the factory subwoofer will not function upon changing the factory radio. We simply don't have a way to easily integrate the factory audio package with a new receiver. I wish I had better news there. You may want to consult with a professional installer.If you decide to proceed, the Alpine CDE-103BT CD receiver offers a great solution with a number of features on board. For even more information, be sure to click on the "Overview", "Hands-on Research", "Features & Specs", "Accessories", and "Reviews" tabs on the individual product pages. You can also click on the "What's in the box?" link to find out what comes with it, along with a downloadable owner's manual.I have created your own online shopping cart with the gear we've discussed, where you can add, delete, or adjust the quantities as needed. You can also click on the items in your cart to find out more about them. When you're ready, you can complete your purchase by checking out at: http://www.crutchfield.com/I-rXYEc555/EmailCart.asp?emType=3&emKey=484861 The Posi-Products car receiver wiring connector kit allows an easy way to connect some of the wiring for your vehicle. I've included it on the cart I created. When you're ready to make your purchase, you can do so from our web site. Please enter my name, Niles, as your Advisor as you fill out our Complete Online Order Form. If you prefer, you can also call me, toll free, at the phone number below. Thanks for your e-mail. Please let me know whenever you need anything else. Crutchfield Advisor,A visitor to our site would like us to e-mail them an expert recommendation aboutCar Stereos & Components - Car Receivers. This person is interested in these Brands:No Brand Preference,And their price range is:$151 - $250Install# 7016 -- 2003 Subaru Outback Limited Edition Sedan With McIntosh audio I usually listen to my music:moderatelyI plan to add power amplifier(s) to this system. Choose quantity:0I am considering adding Satellite Radio in the near future:not going to addShare with communityThe visitor added this personal message:can adapt to existing mcintosh sound
NilesCrutchfield Advisor1-800-388-2911-ext 3154