SFR tune, 93 octane, injen SRI with heatshield, MBRP hot pipe, muffler delete Additions: Heat wrap intake and lowering intake, CERMA engine treatment. Weird idle issue, car doesn't feel smooth. May be new oil and non-oem filter, or need colder spark plugs (HKS M40XL?). Still running stock plugs. Also need to change brake fluid, brakes feel mushy, not related to vacuum issue in brake booster.