Need sifu help ..persona campro 1.6 Auto .
Currently stock extractor ... Only changed spiral bullet and a sflow muffler with stock piping
It is ok if I change to 4-2-1 with those setup above ??
Can someone explain the differences on types of bullet ??
Basic Intake and Exhaust Modification Guide, for normal aspirated cars v1.0
Nov 12 2015, 01:18 AM
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