ok well before im flamed as a noob, i searched and read a bit before asking this.

i failed inspections so i got my new exhaust system , now tommorow im going back to test again. Should i run 93 octane or 89 octane ? when i took the test the first time my OH was high my CO was high and my NOx was high, but i had 1" piping with no cat. now i have 2.25" piping a high flow cat and a muffler from wicked tuning. this is all on a b16.... which gas octane should i run to help pass emissions ?

TIA


i was thinking that because higher octane burns cleaner 93 would be good right ?

 

bump comon please

 

i heard the lower you get better on smog tests.

 

so like i should fill up on 87 ? or 89 ?

 

is the motor usdm or jdm? i heard on JDM you should go as high as possible to not risk dmging ur car..

 

plus the fact that you had no cat... that's illegal in all 50 states! course you'd fail! i say just stick with 91 and test again, with a cat you'll most likely pass.

 

ok , it's JDM and i got a high flow cat but before i didn't have one, i never got under and looked, i just put the stock emission for the CX back on after engine swap because i had no money for exhaust yet. Stock CX didnt have a cat on it lol.

 

yeah cx's cat is on the header. its weird, and extremely ghetto. you should be set with that cat.

 

thanks for the help you are an A++ H-T member