I suppose your frame is build for a 80mm travel fork, when mounting a longer travel fork you'll slacken the headtube, which will result in a more sluggish handling bike.
Your headtube (and thus your handlebar) will be higher and you have to slide your saddle forward on your seatpost, which will give you a shorter effective toptube .......
I had a Diesel SS that was built around a 80mm fork and I rode it with a 80 mm Psylo for a while, but later switched the travel to 100mm and like the way the bike handled a lot more. I wound up selling the frame and fork together because the wheels were too small (I got hooked on 29ers) but it was a sweet handling bike with the 100mm fork. The rule of thumb is that for every 1" you add to the fork length you steepen the angles by 1 degree.
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