forge bpv spring?

channah

Member
:
08' mazdaspeed 3 sunlight silver
on stock boost what spring should i be using on the forge bpv? ive heard red and ive heard blue?
also does the bpv make a noticeable difference?
thanks guys
 
the blue one, I believe there is a whole thread on this already with more info and explainations.
 

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