My friend using Blitz sus airfilter with some engine stall problem.
Once he got this carbon airfilter with OEM style airfilter. the problem has been solved.

Does anyone have same problem with open air filter?

Most BPU (minor mods) Evo user in Japan using stock style air filter.
This one looks cool and it works
Anyway check my new intake system!!!!!!!!

That actually looks really good. Notice any difference in performance?

Is it only a replacement for the upper part of the air box?

i have the Buscher cone filter, and I havent had any stall problems, no idle problems, really nothing bad to say except for removal of the damn OEM airbox.