Are there any tuners that upgrade a Toyota Vigo like the engine, interior, and so on? Not just an ECU tweak or something simple, but a tuner that makes a completely new truck inside and out.

 

I suspect you would have to go to 2 different shops. 

A tuning (remap) shop for engine, exhaust, brakes and suspension, 

And a good speaker shop for the interior. 

Speaker shops hold a lot of competitions for the best turned out cars, with trophies and annual titles at stake. 

If you can research the winners of these competitions, then that's your man. 

On 6/4/2020 at 3:42 PM, canopy said:

Are there any tuners that upgrade a Toyota Vigo like the engine, interior, and so on?

Yes, there are, many.  Buy a selection of Thai car/truck-modifying magazines, you'll be overwhelmed with choice.