Mercedes VGT Tune Needed

[NGHTMRES]

My Mercedes used to hit 302mph with nitro and could finish the Special Stage Route X in under 4 minutes. Not the max it hits is 273mph and gets around a 4:15. What is a good tune to get it back under 4 minutes?

 

[Bowtie-muscle]

Have you put so many miles on it that it needs an oil change and rigidity "restored". Not improvement but restored?

 

[NGHTMRES]

Have you put so many miles on it that it needs an oil change and rigidity "restored". Not improvement but restored?

I recently restored. I have 400+ wins with it.