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I wouldn't put a Jasper into my lawnmower after the experiences I've had/seen. They are a recognizable name and that's about it anymore, their warranty on diesels are 12 months/12k miles and if you're even barely outside of either one they won't even work with you.
Only a one year warranty, BUT unlimited miles. I can vouch for their stuff - my FIL got a 6.4 from them and the only 'upgrade' he added was head studs, because they'd already done most of the rest with the internals.
After much research and what seemed to be best warranty. I went with https://choateperformance.com/, It was more expensive but they build a much needed upgraded 6.7.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.