Now, I appreciate everyone here and the fact that they haven't rejetted their carbs after installing V&H pipes w/o earshave, but I'm having a tough time swallowing this one. I've done a lot of tuning of carbs on performance Mustangs as well as EFI tuning via software on the more modern Stangs - the basic principles of tuning that I've become so familiar with should still apply to the little 749cc V-twin motor in our Vulcans. After I installed V&H pipes on my '02, I can tell it's a little bit low on power. When it's fully warmed up, it does feel like it's running slightly lean. And I mean slightly, as in so slight that the plugs aren't showing an excessively lean condition or anything, which would also explain why it runs pretty decently. However, in order to squeeze maximum power out of the exhaust upgrade, it's definitely going to be necessary to enrichen the mixture in the midrange and top end. The idle seems like it could stay as is. If I could devise a little device to hook my wideband O2 sensor to the exhaust pipes, I might be able to figure out exactly how lean it is with the A/F reading.
I dunno... I just expected to gain power from the pipes, not lose some.