If you were not experiencing knocking/pinging then you should stick with 87. If you were experiencing knocking/pinging then a higher octane is a temporary "fix". High flow filter, jet and exhaust don't require a higher octane unless you have somehow increased your compression ratio. Even the more recent engines can use a higher compression ration but require a PGM-FI and ECM that handle the lower octane. ie Gold Wing has a 10.5 compression ratio and recommended PON is 86.
Last edited by gdb069; 07-10-2019 at 02:13 AM.