Welcome to the forum, Allan.
MN Triton and turbo lag go hand in... We call it the "calm before the storm" once that Turbo is spooled up all hell can break loose.
Being a manual you'll eventually learn to drive around it.
In my experience, throttle controllers only make it more noticeable. The sudden change between nothing to full boost is more violent due to the quicker throttle response.. Some people like them but I think they suck.
Also, I wouldn't recommend going down the road of the "cheap plug and play chip" of any brand, unless you've got someone that really knows how to set it up and tune it to your vehicle correctly.
If you want real world performance out of a "plug in chip" and get rid of most of the lag? Then unfortunately you've got to spend upwards of more than a grand. A good quality chip and then the tuning will cost similar to that of a good quality ecu loaded tune.
Do your own research and find a reputable chip company that can also custom tune it for your needs. This is super important for common rail diesels.
Do all the basics first, grab a 2micron secondary fuel filter as this will help keep your injectors in good shape, especially if you're running a chip or tune.
There's also tricky way of waking up these turbos without the use of chips and tunes...
but that's probably waaaaaay too much information for you at this stage.. And I'm NOT qualified to explain it! but I can say it involves some complex plumbing, dawes valve and the bypassing of the electronic boost solenoid... Aka as the "lag solenoid".
All info is buried in this forum, somewhere.
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