Replace and Repair Maintenance, a.k.a R&R Maintenance, a.k.a Corrective Maintenance. Also Preventative Maintenance. Although those may not be the best bang for the buck upgrades, in my humble opinion, that's the best place to start.
I think the best "bang for the buck" HP adder for any car is Nitrous Oxide. The other would be upgrading the exhaust starting with the Turbo Exhaust Elbow --> all the way down to the exhaust tip.
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