is there a hp diffrence with tailpipes vs. turndowns

[Ron1]

Pressing? Who pressing? Just a lively discussion. The FB is a track car, yes. But my Coupe was not, daily driver. Mandrel bent pipe, 2 1/4 exhaust, flow masters and long tube headers. When you ordered your exhaust did you request mandrel bent pipe? All I am saying is that if you only do the exhaust you are looking for trouble. Every thing changes or has to change. A/F ratio, jetting, timing...
And as far as me being correct? I am just quoting some passages from someone whose opinion I respect. I am NOT an expert. You can write DV through his web site directly www.davidvizard.com and tell him what you think.
My last question is how do you adjust back pressure? They measure it. Oh, oh..too low. Now what?

Ron