Im looking to buy a 4# lower pulley soon.
Would it be ok to run it for a couple weeks with out a tuner?
Which pulley do people prefer, where can I buy it for the cheapest?
Which Mods should come after the pulley?

 

You should be OK without a tuner to a point. Some have run a 4# lower without a tune no problem. I would go easy and listen for detonation. Look here for used parts.....You will benefit more with a tuning device to go with that pulley....

 

An open air filter, pulley, and a tune is a great way to start.

Many of us lean toward the interchangable pulley systems. We change our minds from time to time.

FF