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Message: <blockquote data-quote="cantbuytime" data-source="post: 852090" data-attributes="member: 12590">@Comp orange. I say cut it all flush and use the stainless band clamps to connect to the headers.. If not PM me. I have a few ideas I was going to fab up for exhaust connections. I got quick release that would be sick. maybe you would be interested in fabbing it up yourself. Free is always better. LOL.Not knocking you Aaron. I have spent more time in school then actually working in the field. Sad right?You make valid points with the exhaust slowing down because of it cooling.. We are talking about a race car, not a street car here. I would think it can only hurt a mod motor that needs the bp or a completely bone stock pushrod car thats got no cats. yes 3" on a very mild to stock street car is overkill.. But each engine can/will respond differently to the exhaust size. Muffler design, cat design and bends in the pipe.In fact the part that ends up hurting an engine is the primary tube size. This is were bp and flow are more important. Too big of primary pipe and it will hurt a mild to stock motor.There is a reason when we port heads, that we open the exhaust ports more then we work the intake. Whats the point of flowing in 300cfm and only flowing out 200cfm? leaves spent gasses in the cylinder. Also going to larger diameter pipe allows the exhaust to cool quicker and slow down there for raising the back pressure.A long time ago We built a mild 305 Chevy for a students 78 Chevy truck. I say mild, but it dyno'd 323rwhp/337rwtq through an auto. That was alot of planning and meticulous details. We put the Mufflers exactly 18" from the header collector, that alone gave him 6hp.. he ran 2.5" exhaust. Not even 2 weeks later he got T-boned and totaled the truck. So we swapped the drive train over to a 75' Chevy. The only difference was we went back with 3" exhaust..The HP increase was almost 30RWHP , if my memory serves me correct it was about the same amount of tq picked up as well. I have had people try to argue that Ford and Chevy V8's respond differently to exhaust, but in all reality they are basicly the same.</blockquote>