A 2 into 1 is a great pipe for making smooth low end torque, problem is nobody makes one for a Triglide. It's hard to beat the factory 2 into 1 into 2 design, a Fullsac Sport pipe http://fullsac.com/product/fullsac-sportpipe/ would be a nice upgrade if all he is doing is maybe a cam at a later date. I would avoid true duels like the plague, they're great at killing low end torque and shifting the torque to a higher RPM which is the opposite of what you want on a heavy trike or touring bike.
A good tune will work wonders at smoothing out the engine, making some more hp and torque, plus cooling it off a bit.
My 07 streetglide, has true duals, with fishtails, power commander, kn air cleaner element. True duals installed to get the heat off the passengers leg, but i must say i thought it was me, it does seem a bit sluggish at low speed, riding two up.
Mid range it runs good, solo or two up, i can feel the sluggishness one up or otherwise. When i go to start it cold it usually kicks back on me if i hold the button down for a long burst.
I think its still too advanced on the timing, but my bud did the download on his and mine, his straight piped heritage 06 runs strong, mine runs strong jus don't like the starting issue, but if i hit it quit it, and hit it again or again , it fires and doesn't back talk.
I have a soft tail oil cooler mounted on the left side close to the filter, im thinking of mounting a second cooler on the rear crash bar, one with a fan on it. $85 chicom special.
Im running a Harley parade fan for the moment, altho the werks fans intrigue me. Never thought the heat would be an issue, an doesn't seem to be on my shovel or evo, but 07 08 are notorious, in this.
Tried some gold-wings in the past, but my feet jus don't fit, and im a Harley guy., but that victory and that Indian, look good, its jus the price that keeps me at a distance.
Any advice on the power commander setting ? don't know of a tuner in this area, but i guess i could ask around. See what that brings.
True duals
fishtail mufflers, longer than the bags
kn filter
power commander
Stock otherwise. with mmm, 3k on the new motor after the old one broke the oil pump in 4 pieces. Thanks