from what I have read so far it seems that the best choice for this bike would be the supertrapp version of these pipes over the h-d version. this being the case, with a 110 inch motor that has been augmented with a non-cat head pipe, should i start out with the closed end cap with 12 discs? i am considering a k&n air filter with the screamin eagle race download in addition to the mufflers. any input would be appreciated.