yes, you can do the mods with out using e85. el headers and silicone intake can be fitted but you will need to tune it afterwards to get the most out of the new goodies, with those parts you should see anywhere between 300+ ho depending on who tunes it and how much time is spent on the tune

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Marti


Car: C Red S13 Silvia 2.3l 400+rwhp-SOLD
Daily ae82 4age corolla (light mods)-Sold
Daily:SWB GQ Patrol
Will be a 03-04 STI next