Board Thread:Questions and Answers/@comment-177.154.150.65-20170928133216/@comment-27736210-20170929230555

Alright.

So, you need to upgrade the top speed (turbocharger) stat 4 times.

Then, upgrade the nitro (bottle) stat 5 times.

Then, upgrade the suspension (springs) stat 5 times.

It's pretty simple.

Just don't upgrade the other stats.

By the way, you press tuning and it goes to Upgrades (MAX) by default. MAX contains the turbocharger and the nitro bottle. You then have to click Pro Kits to upgrade the suspension. Also, you need cards and credits to upgrade suspension but you only need credits to upgrade the turbocharger and nitro bottle.

You might not have enough engines, though. The Porsche 959 requires 4 High-Grade Engines as well, for suspension.