[AMS MIKE]

so what can I fill my 135 with to give it a little more fun?

103 unleaded is the highest i would run. Leaded fuel will fill your O2 sensors and Cats

If you simply add 103 octane to a stock 135. you wont notice anyting except you wasted a lot of money. Its expensive these days.

turn up the boost and add spark, you will notice a difference

What higher octane fuel does is allow you to turn up the boost and add spark in a safe manor w/o det.


warning! KNOW WHAT YOU ARE DOING BEFORE TURNING UP BOOST OR MESSING WITH ANY ECU PARAMETERS.

 

[AMS MIKE]

Will it work with a JB 2.0 tune? If anyone is familiar with bmw tuning.

the JuiceBox 2 is entry level few wire piggy back unit and increases boost about 2-3 psi and is safe for 91 octane. Sure you can use 103 unleaded octane. Its a waste of money and you wont feel any difference since the spark map is tuned for 91 octane.