new exhaust equals little smoke???

91whiteponygt

New Member
Mar 24, 2006
61
0
0
just installed mac off road h-pipe to flowmaster two chambers, it puffs a little smoke if i rev it and let off, is this just unburned gas cause of 93 octane and no cats or do i need to get rid of it, it has just unbder 83,00 miles?