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Lots of mods are BS, others do offer real performance gains.. The problem is that most parts are sold for the wrong purpose, for a sound or look.. These vendors are not engine developers and generally they know nothing about the internals of the engines.
To see big gains we have to do intervention to cams, heads and compression ratio.. Bolt ons will only give a small percentage of gain, or loss.
The factory did some things right and others very wrong..
Making more real power requires a substantial outlay of funds, but thats the way most any engine is in reality.
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