Looking for opinions on a SE 585 in stock 110 with Vance and Hines power duals and os450 slipons or doing a full SE 117 kit. I want strong low and midrange with a little higher Roma before drop off. I haven't even ridden the bike yet but I'm coming off a 2013 ultra with stock 103 and SE 255 cam and really like the power but not the wall at 4500 RPM. My dealer will honor 2 year warranty if I use SE products. The SE259 in the 117 looks like a high RPM cam but showed decent lie RPM torque so I'm confused lol. Last option is run it stock for a year and use aftermarket after that. Open to all thoughts. Thank you.
The Power duals are pretty good. The 450 slip on will Hurt low end torque, not near enough back pressure, not even with the 117. Same with the V&H high outputs, they hurt low end torque. Those big mufflers are built for sound, not low end power. You want something with a 2" or a 2.25" baffle in them, not the big baffles.
I can't speak to the 259E in the 117 from personal experience, but from they dyno sheets I have seen it has pretty good low end torque.
My 13 SERK has a 259E, with 10.8 to 1 compression and worked heads, I have 100 torque at 2500 rpm, 110 torque at 2750 rpm and hold 120 torque from 3250 to 5250 rpm. Its a blast to ride, 122 HP, but the torque is what makes it a blast.