The only difference between a stage 3 and 4 is the JWT **** and a 5 angle valve job versus 3. The only thing I see him doing differently is maybe using a tiny bit of lube when he screws you since you paid the extra $$$ haha. Seriously though, good luck with the build. If the motor does break don't bother sending it back to them, just get it looked at locally. No sense in paying to ship the motor across the country for a warranty that isn't honored in even the most obvious scenarios.
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