So here's a question for all you SC people out there. I've noticed a buildup of what could be best described as an oily film on the back of my Elise since I installed the BOW 300TVS. Anyone else encounter this? I know that with the bigger fuel injectors you are dumping more gas in the hole so to speak, but I have also noticed a slight fuel odor on certain downshifts. My exhausts outlets also have a significant soot buildup as compared to NA. I don't mind, except for the fact I want to a) make sure this is normal and b) fibure out a better way of removing it besides using dawn and then reapplying my wax.