GT43 TUNES?
https://www.racechip.us/shop/mercede...-500lb-ft.html
DTE is better, from comparison videos I've seen, but a lot more expensive. They have a throttle response solution called PedalBox, as well as a tuning box.
https://www.chiptuning.com/us/merced...ercontrol.html
https://www.pedalbox.com/us/mercedes.../pedalbox.html
Short of the 53's electric auxiliary compressor that's built into the turbo, that should unlock quite a bit and take you pretty close. Just make sure the right 43 is selected, looks like there are two on one of those links.



