Okay if I do the Metra harness 70-2056 would I need to run the wires under the dash then down to the amp? Any pics of the install would be great. Another question would there be any problems with the rear speakers as they are still stock speakers? I don't want to blow my new HU.

BUMP

Okay, I have the 2003 Vibe with the factory hu and amp. The front drivers side stock tweeter went out, so I decided to replace the front component speakers and tweeters with Alpine SPS-600c. Using the factory wiring I spliced in the woofers and ran the tweeters thru the woofer as the diagram suggest...