Ive had little hicups after fitting the system, but car related though, Just got it fixed today...I had the up-pipe fitted the as well, Ive noticed quicker spool up, nice whistling sound too
Exhaust has a very low nice sounding note, does not drone at all in the cabin,
I rekon the up-pipes worth fitting too,
I had mine fitted from fatsport for $220, with the up-pipe,