135i 2010 steptronic gearbox
hello how are you ???
i have a 135i steptronic n54 engine, i have some doubts about jb4 repro, downpipe, cai etc.
basically i donīt know how much power the gearbox support, because i dont want destroy the gearbox, so, how much horsepower will support ?
you can recommend me to do?
i think the with jb4 repro and cold air intake its ok ?
wait your answers
thankyou very much