The only aftermarket ignition system I have had noticeable improvement with is MSD 6 for a street driven vehicle. 100% reliable? Absolutely not. They can leave you stranded just like any other electronic device. Faster starts cold than points? yes. Cleaner warm-up? yes. Better driveability at low speeds? yes. Smoother idle? yes. Stronger acceleration? NO Better 1/4 mile times? NO More peak HP and Torque? NO. So it all really depends on what you are looking for and the level of tune perfection your engine package has. The multiple sparks at low RPM, can cover up and band aid a non-perfect tune and less than optimal fuel IMO. Stock points and coils have limited total voltage capability and one spark. If that's all the engine needs, there will be no difference. That typically shouldn't exceed 10-12 KV. But an MSD has multispark capability at low RPM's around 3000, and 40-50 KV capability depending on the box. I only run the old MSD boxes which were USA made in Texas. All the new street stuff and most race stuff is made in China now, so no comment on their reliability.
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