Ignition upgrades by themselves usually don't add any major HP, if any. The benfits are a stronger spark, and generally smoother operation. If you have to gap your plugs tight to keep from missing at high boost or RPM, and loose some driveability as a result, the MSD will allow you to open it up again and get it back, and then some.
I haven't put a MSD DIS-4 on my MKIV yet, but I plan to.
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