SOrry bro, i've gone through 3 turbochargers on my KA-T setup for even my low 6-8psi boost. First one was a T3 garret 60ar comp with .63 ar exhaust Garrett----almost no response, couldnt really feel it do anything. then next was Garret T3/T4E 50 Trim compressor .63 ar Exhaust-- WAY BETTER , it kicks and pulls!! next i went to T3/To4B garrett 60 trim comp with 50 wheel .63 stage III . THis turbo is basically the best setup there is for KA motor. IF you plan to go to 12 psi and bother wasting so much money on turbocharging your car i suggest you not do what i did and many more. Save your money and get a real turbocharger. i got my T3 from a junkyard- yeh it worked, but i wasnt happy with how slow it was, and neither are others that put T3's on KA, and yurs is a .42 dang thats even worse. sell it and get t3/t4. Save up if you have to, cuz it will save you THE BIGGESt HASSSLE EVERY. 5psi, T3/To4B will respond insanely quick if you do the right match and will flow crazy. save up if you can, if you need help i can get you a new Garrett T3/To4B for $550 or same for 600 with internal wastegate too. i dunno, if not, just try to find a used one. later, good luck
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