[Melas]

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.

[JoeSixPack1]

I also have a new stock cross over pipe w/ hooker slip-on exhaust (old one had a stress crack down by r/s passenger foot peg)

and

Screaming Eagle(SE) 9.2X1 HC heads (*uses the same sparkplug as sportster)
Weisco piston (Flat)
Jugs punched .030 over
Shaved .014 off the bottom of each jug
SE ring kit
SE high output coil
SE Adjustable push rods
SE Hyd Lifters
Roller rockers tappets
Andrews EV-51 cam (Dumped the ev-27)
44mm SE carb w/thunder slide kit (+ couple of big jets)
SE breather kit & air cleaner
2002 HD TC open air intake
Crane Fireball high-4 ignition modual w/exhaust sensor
1 tooth oversize drive pulley
AM/Fm/cassette, cig lighter

ash tray, toilet, sink, sleeper...oops wrong vehicle..

and a partridge in a pear tree

1995 EVO 1340 rubber mount w/over 83k miles FLHTC

<|:-)~~

[-YYZ-]

On the subject of LOUD PIPES I must say, I don't like them. They're annoying to pretty much everyone within earshot and they're make our (motorcyclists') image with the public even worse than it already is.

BTW, my stock-mufflered 1000cc V-Twin powered bike makes about 90 HP and will do the quarter mile in about 11.5 seconds, which makes it more powerful and quicker than about 90% of the loud-piped Harleys on the road, all without pissing off all and sundry. And given a place to do it it would run all day at or near its HP peak.