Anyone heard of these guys, or have any experience? Are they legit ?

They have a couple diff piggy back options it appears.

one to bring the GT63 to 712 HP, and another to bring it to 805HP. It appears that maybe the 805hp version needs upgraded turbos, but the details on their website leave a lot to be desired.

I believe the Renntech one quoted 725hp, and the RC I think mentioned 60-70hp increase over stock. Would be interested to see if anyone knows anything about these guys.

I sent them an inquiry but have not heard back yet, so if anyone has any good info, please pass it along! Thanks in advance

https://www.performmaster.com/tuning...s-amg-gt-c192/

Hi. They say they don't ship anything to the US. Here's what they said in response to my inquiry:


Thank you very much for your patience. We had to wait for final confirmation to be 100% certain — and I am now pleased to share the full overview of our performance solutions for the GT 63 AMG. Performance Upgrades Stage 1 – 712 hp / 920 NmPower increase to 712 hp and raised torque output.Installation via an additional control unit that works hand in hand with the original ECU.No overwriting of the OEM ECU, fully update-safe, removable without leaving a trace.Road-legal and reversible, with all engine protection functions intact.Stage 2 – 805 hp / 1,020 NmSame optimization technology as Stage 1 (additional control unit, no ECU overwrite, update-safe, fully reversible).Installation of upgraded turbochargers to unlock the full 805 hp performance potential.Road-legal, all safety and protection functions intact.A true step into supercar territory, with brutal acceleration and uncompromising dynamics.InvestmentStage 1 – 712 hp package: €6,190 net (excl. VAT)Stage 2 – 805 hp package: €19,900 net (excl. VAT) The result: a GT 63 AMG that delivers next-level driving pleasure, dynamics, and visual presence — with the reassurance of tested quality. Regarding the installation:The 712hp option is available exclusively through our PEC tuning module,which we can ship directly and can be installed by any experienced Mercedes mechanic (you also get the installation manual),whereas the turbo upgrade to 805PS requires a visit to our workshop. If you have any further questions or would like to discuss the next steps, please feel free to reach out anytime.We look forward to taking your AMG to the next level.

Hmm, good to know. Thanks for the reply. very helpful.

I didn't realize at first on the 805 hp version it would require new turbos also until I found a video online somewhere. I was hoping it was just a really strong piggy back tune, which it seems like it maybe is, PLUS new turbos.

So seems like the Renntech is likely the best option maybe still , especially since they dont ship to united states.