p1 b/b compared to s/s
The p1 embrosed upgrade backbox is very quiet to a scoobysport one.
I have had 6 different backboxs on my p1
(1)Standard (Very quiet)
(2)P1 upgrade (quiet)
(3)scoobysport (Loud)
(4)Scorpion (quiet)
(5)Afterburner(very loud)
(6)Hks hyper (Loud)
and found that the afterburner was very loud but sound very nice,
Currently running a Hks hyper just for power reasons
R.B
I have had 6 different backboxs on my p1
(1)Standard (Very quiet)
(2)P1 upgrade (quiet)
(3)scoobysport (Loud)
(4)Scorpion (quiet)
(5)Afterburner(very loud)
(6)Hks hyper (Loud)
and found that the afterburner was very loud but sound very nice,
Currently running a Hks hyper just for power reasons

R.B
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