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100% on the money!! (and I found something to talk about!!)

V-twins valve geometry have a minimal % of overlap where both valves are open. Straight pipes and over baffled pipes fail the basic designs by not allowing the exhaust gases room to create a vacuum from that overlap which pulls more air into the chamber thus making a bigger boom in the chamber giving you more HP.

That extended valve opening works with the same principal as an automatic pistol chambering a round works, thru spent gases.

A 2into1 or even a false 2into1 creates that suction.

Me - I have a set of hooker exhaust on stock pipes with adjustable baffles. Left side closed all the way, right side open - false 2into1. Give me that throaty low rumble, except when I nail it and blue flame shoots out, front wheel jumps off the ground and everybody takes pictures while I ride a full dress wheelie through 2nd gear!!!

(gotta rejet and retime, oh did I mention the 110 octane race fuel available at the local Sunoco??)

<|:-)~~

There's a guy around these parts who runs THREE nitrous bottles on his Bagger; two of the little 4" diameter x 12" ones (one on each saddlebag rack) and one BIG one hanging below the Tour Pak, all chromed. He tells me he went to three because he was tired of running empty in a single night. He says it'll do wheelies in fourth gear.

Big strapping Indian Outlaw dude. He's either full of Barbara Streisand or stone cold crazy; I can't decide which.

V-twins valve geometry have a minimal % of overlap where both valves are open. Straight pipes and over baffled pipes fail the basic designs by not allowing the exhaust gases room to create a vacuum from that overlap which pulls more air into the chamber thus making a bigger boom in the chamber giving you more HP.

Exactly, which is why I have have the stock crossover pipe on my Sporty with modified slip-on baffles. I have all the WOT I need, but with enough reversion that I haven't sacrificed any mid-range torque to get it.