Got an 06 1300C mtr trike, came w/samson straight pipes. that's what they put on at factory I guess. wife hates noise(her trike). I'm putting a car muffler under it, using 2into 1 pipe as connector. anybody else done something similar. 2 into 1 into car muffler shouldn't give too much back pressure don't think. adapter should be only question point.???