I have no clue what kind of tips, the guy at Minute Muffler opened up his catalog and I picked them out, they were supposed to be a "D" shaped tip but like you say they just look kinda strange.
As for being clean just washed and waxed her today
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03 GT: K&N FWI, P-Log&PEM, ZZP downpipe, Dynomax ST muffs, HV3 insert, Harland Sharp 1.9 RR's