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This is an under the car system, more like FIA type on 289 body car, but the tip itself angles at about 45 degrees than 90 degrees. It is a straight cut through the 3" mandral bend that I used for the turnout. When I constucted these the intent was to develop primary tube length instead of the block hugger type that were used on the Road Race 289's. They are very efficient and work well, you should be able to hear me driving from where you live
As far as sound reduction, with a big inch motor developing the HP yours is and with the confines of a sidepipe design it will be pretty LOUD or you will sacrifice large HP. So weigh your options and develop a plan. Here is a link to a very good company in Rancho Cordova that does 1st rate work. The used to buld some systems for some of the Trans Am cars a few years ago. I remember seeing Huffaker Engineering's car in the shop.
http://www.spdexhaust.com/index.html