How do you guys make the HKS style mufflers look so perfect!!???? I have read the how to's and I want to make it out of aluminum...not styrene it looks much more real outa metal tubing. My questions are, how do you cut it so its perfect looking and still round? How do you make them look so real, I am talking about the gab between the big part and then the little part, what is that filled with? Its confusing but I mean, the easy way is taking a big piece of tubing and sliding a smaller piece in the middle, but that isn't supper accurate, you guys use like way big tubing then way small tubing, what is keeping that small tubing centered? Thank you for any and all help