User blog comment:Mr. Mysterious Spyman/(Repost) Multiplayer Cars List (T&T)/@comment-30294077-20171105200450/@comment-27736210-20171105220713

Btw, Feuerrm, I think it would be a good idea if you figured out how to tune cars without using the unreliable Tuning Calculator.

You should figure out how to calculate the tunes by yourself.

Some simple rules:

1. There are increasing percentages for all upgrade stats (and most have been figured out, so ask around); Upgrades + Pro Kits - 10/15/20/25/30.

2. The Tuning Kit is the next MAX level (apart from level 5, which is slightly worse than the level 4 boost).

3. The tune of 0400 5050 has the same speed as the MAX + PRO tune (following the previous rule) so it's really easy to figure out the speed for this one.

There are more rules but this is all I can come up with right now.