i dont know about u lot but in my experience with the 1.3 n 1.4 changing the backbox for a performance item really didnt do much, infact i felt it lost alot of low-end torque n power but what did u dudes experience?
There are performance backboxes that create a vacuum, and 'suck out' the bad gases, so the engine breathes a lot easier, resulting in a power surge
Don't laugh, this was the description of the overpriced itemlmao
lmao - sorry laughed.
same category as the 'friction eliminators' and 'filterchargers'