Exhaust with torque loops, paired with Guhls remap should yield noticeable results.
States it improves, smooths out shifting, increased torque and horsepower across the entire rpm range.
A friend did this, the pipes looked amazing and finished his black and blue look (Black pipes) and sounded amazing. Friend did this and noticed smoother easier riding in low rpm range and more torque, Hp, and pulled like a train from 3000rpm and up.
That bike was offered to me and I'm still kicking myself.
I asked to see dyno charts, (from the bikes owner) reputable engine tuners provide this, usually on their website before you purchase. I did not see them, so it's only hear say at this point. If I find solid info. I'll share it.
I did ride this bike, although have nothing to compare it to as I did not ride it before the re-flash and exhaust work.