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Drove truck to and from work today and noticed at WOT it makes a high pitched chirping noise coming from driver side of motor is this what it's supposed to sound like now with the frx or is this any issue air/fuel leak? Truck didn't do it before frx, injectors are only a few months old if it...

Installed the hpx last night truck is much smoother at idle quited the single shots down a lot Took literally 20 min to do, just had to take intake out, installed the frx tonight went pretty good little over an hour but forgot to re instal the plunger into bowl first time around...

First off new to the form and all info is appreciated! As title states I'm going to be installing a frx and hpx from riffraff soon my main question is what are the pros and cons of the higher and lower springs in the frx kit I know they regulate fuel pressure but why wouldn't you want to use the...