Hi guys.
Can you guys explain which is the best center bullet for my lmst because i want replace my empty stock mid box with a better one.(swirl center bullet,straight flow with fiber inside or midbox with fiber inside).
Atter the tuning,will it affect my top speed,high end,low end or torque?<--my noobie question
City driving-->70%
Highway driving-->30%

Just changed my extractor to 4-2-1