Does anyone know how much of a difference in performance there is between oem cat converter vs. high flow cat converter? I'm thinking about replacing mine sometime soon cause there's some rattling happening down there.
|AA stage 1 software| UUC light flywheel and clutch| UUC EVO 3 ssk | K&N Intake | Ebay Headers |
Founding member of the hit 145 mph in my almost stock 325i BMW club.
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