Octane 91

[piskoil]

Hi guys

I would like to know should I use 91 octane if I have a cold air intake and a full new exhaust with header and magnaflow catalytic converter and tanabe muffler?

this is a 2007 Yaris manual with 228000km

And it is true the octane 91 is more clean ?!

[bronsin]

You would require higher octane only if the compression ratio has been increased.

No 91 octane would not be any cleaner

[mitch9521]

Stick with 87.

[piskoil]

Thx guys! ��