Well I must be deaf I think...I’ve installed the triple KNs , air box delete, DP outlaws etc...I have never heard this ‘ exhaust sound coming from the intake’ ? It’s sounds great and I guess a little different at the intake but not too decearnably so. Nor have I noticed ever the’chirping’ I’ve heard so much about. Could be that the DPs drown out the other ‘new’ noises. Or, could be I installed the exhaust , airbox delete , PCV / AT , Ozclaw immediately after I had its first service so within 1st two months.
Anyway , this is my third Rocket and I honestly cannot tell you I’ve ever significantly noticed much ‘extra’ noise at all. (My filters are now behind ozclaw). I feel I’ve missed out on something somehow?