TBO GT class Changes need to be done :
XRT,FXO,RB4.

weight/power ratio similar ( for balance )
adding better tires half slicks ( between road super and GTR slicks )
power increase 260-280
increased REV limiter to 9 000.
short time to turbo spool.

adding wing for small adjustment, not as GTR. 1-10 max.

open wheel events is almost 90%.

5 mn of dreams is over. cya on road racers....

I'd rather add one car to TBO class. Naturally aspirated 3-or-more-liter inline 6. I know it wouldn't fit there by definition but it could add some variety and gorgeous sound of its engine. We can go crazy of course and add another one to the LFR class and call it "S" version

I think maybe BTCC or JTCC style.

Engine N/A
rev limit 9500
290-320PS
and maybe little wings + easy engine crack