While I agree that interference is not eliminated, our CDI units do not emit anything even close to 2.4 ghz. The rx will remain solid in all circumstances. That being said, a loose or damaged plug cap/wire can emit enough noise to get picked up by long servo leads, regulators ect. This would happen regardless of equipment placement. My current gasser runs a Tech Aero IBEC and my dual rx battery packs aer two inches from the ignition. Going into my third season with that setup, approx 300 flights.