Hello. Purchased a TFI for my 08 sporty 1200 low 800 miles ago and the last 100 miles noticed my forward slip on muffler tip has much more soot build up than the rear. The bike has rush balony cut slip-ons and stock intake and the TFI is set at stock recommended settings. The bike runs fine, just curious if others have seen this before, one thought was airflow difference from forward to rear pipes. Your thoughts are greatly appreciated.