Subaru turbocharged engine...it runs better and safer on 98...else you will have carbon build up, knocking, and a damaged engine very soon.
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06 STi: 337hp @23psi on E85...
06 STi: 309hp @22psi on 98ron...
Last edited by RJ999; 17-03-2014 at 10:58 PM.
Reason: added safer
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