WE have all seen the adds and magazine advertisements, that show an instant 15-20 hp boost with a simple chip swap...
YES in some cases, THERE MAY BE minimal gains,
BUT IN MY EXPERIENCE, you'll get a great deal better real value ,if you carefully research,
your other options , like headers ,ignition upgrades, a performance intake upgrade, and in many cases just a good tune-up.
Ive seen several guys dyno test, before and after with the chips from several sources, one guy LOST 3 hp, and several gained 4-7 hp even though most advertising listed 15-20 hp gains
now you have to consider the guys programming the chips , compare the results, to a stock engine, then they optimize the engines , do a tune,and then only program the chips.
now the concept has obviously improved over the years,
but when I installed a chip in my 1985 corvette , back in the early 1990s, it made a bit better lower rpm power, (about 7 hp, but it made no difference above about 4000 rpm.)
I took it out about two years later when I started having intermittent idle issues and those issues disappeared.
yeah, not all that impressed but your results may vary