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Back in the day, it was easy to bolt on substantial RWHP gains because the OE bits were almost crude by comparison to the aftermarket parts. These days, The OE guys are very good. You can still find gains and substantial gains with aftermarket power adders. They don't always show in the final RWHP numbers. You have to look at the low end and mid-range gains. Adding 20, 30 or 40 RWHP between 3K and 6K with a final RWHP gain of 5 or 10 produces a better driving faster automobile.
As good as the OE stuff is, a good tuner and quality aftermarket power adder bolt ons will deliver significant performance gains on today's best built and designed engines.
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