Mitsubishi Evo X tuning bug

I’ve noticed a bug for upgrading the turbo on the Evo X. Upgrading it to sport turbo actually hurts the P.I. and offers no hp increase along with later powerband. Upgrading it to race turbo will upgrade the P.I. but still offers no hp or torque gain and yet again an even later powerband. Just wondering if this was ever going to be fixed or not (especially since evos in reality have the ability to make huge power).

It has been mentioned many times and has existed for the last three games but T10 don’t seem to care to address it.