Curious about the new v6 / exhaust diameter sizes

[Blade]

Originally Posted by PT145SS

I was not trying to second guess anyone, I just wanted to understand. This is a forum with all levels of knowledge and I was asking the questions so that I could learn from those that are more knowledgeable than me. At first glance, it seems as though backpressure is a bad thing and it was counter intuitive for me to think otherwise.

In fact, both articles still say that backpressure is bad to some degree. The second article articulates the fact that some resistance is a necessary evil to maintain velocity. I would not have known nor would I have thought of that unless I asked the questions. It’s also interesting to note that 3” pipes might be best if One wants the power band to be in the higher RPM range. I would not have known that either, had I not challenged you guys for a better explanation and had I not challenged myself to do more research.

I don't think you were either.

[usa1camaro1969]

The way I see it Chevy had 2 1/4" pipe on it stock. I went to 2 1/2" and I'm staying there. At what point are you thinking you are going to kill the exhaust flow velocity on a non-FI small v6? I've seen big block v8's that had smaller exhaust stock. It might be how they made such a jump from stock just by opening up the exhaust and it might have been how the stock manifolds were so restrictive.

[VR Baron]

Originally Posted by Blade

Well you can try 3" if you want, I have read those articles too, but then again you can be at the wrong end of the spectrum and over kill it. From what I read and with talks with experienced muffler shops, 2.5" seemed good for this engine. Maybe you will be the one who changes everyone's mind.

My muffler guy says the same and Magnaflow backed him up when I was thinking about upping to 2-1/2". 2-1/4" maintains the torque where the 2-1/2" loses some torque but gains a little (1-3?) peak hp. And forget 3".
Want to up the torque so stayed at 2-1/4"