Problems K20a turbo
89 aint good for fuk all but your lawn mower , haha. even if you spent the money and bought 9:1 pistons and rods , 89 octane fuel is still a problem in the long run. invest in a meth injection kit and keep the bottle full , lol. that or keep stocked up in a good octane booster. run this tank to E , next time you fill your tank , put octane booster in the tank first , than pump your gas. once you do that , come back and let me know. its really your only solution. like 89 would be hurting you even running NA , lol. not as much.