No.
You may want to check your alternator as well.
This may get a little involved, so follow along:
1. Get your favorite buddy (prefferably two,) to bring their vehicles over
2. Remove battery wires.
3. Hook up a set of jumpers from their vehicle to your battery wires. NOT THE BATTERY, but the wires.
4. Have them start up their vahicle, and rev it. If you don't get any accelerator whine, it's your alternator. If you do, try your back-up buddy, just in case your first buddy's alternator is on the fritz.
If you get EMI whine with both vehicles, then... Plugs and wires. I wouldn't waste my time with inline noise supressors.
Or, it could be that your deck is just too sensitive to EMI, like mine is... Especially if its a Clarion joyride. UGH!