Talk:GTE-Pro: Chevrolet and Porsche/@comment-108.206.39.138-20160519001856/@comment-27162643-20160519014013

The cheapest way to reach PR89 I believe is by skipping last two engine and drivetrain upgrades.

Can refer here http://rr3.wikia.com/wiki/RR3_Wiki:Upgrades_Section_Porsche#Porsche_911_RSR_.282016.29