single or dual exhaust???
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Joined: Jul 2009
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From: LA 626
single or dual exhaust???
as of right now i have dual exhaust with stock piping, y pipe and headers on my 91 s5 NA.... but i just got a set of rb headers and prescilencer that i am gonna install... should i just stick with a dual exhaust and get a 2.5 y pipe made or make it to a 2.5 single exhaust??
will i gain/lose back pressure or hp?
will i gain/lose back pressure or hp?
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