Hey guys, Just the good old question about the exhaust system, 2,5" or 3"? I have a 440 HP engine in my '69 Coronet R/T, got the TTI headers with 1-7/8" primary's and 3" collector. Now to continue this pipe, go 2,5" or 3", as per TTI the 2,5" system is good for up to 475hp. Engine is not stock, Hughes camshaft (HE3844BL), 238/244 @ 0.050", .572/.576" lift, Edelbrock performer RPM intake and 770CFM Holley carb. My idea is i will not make 475hp with this combo, then again a lot of people say to go with 3". I am planning to go with the H-pipe design if it makes a difference. Would it make a difference in exhaust note as well? Any advise is welcome!