OK how about mufflers only stainless??
Slip-ons aren't cheap either, just because there's two.
If loud is what you want, any slip-ons or bolt-ons can be cut shorter or have some packing removed(slip-ons have midpipes that fit to the factory header, bolt-ons are just that, mufflers that bolt to the factory midpipes).
If you want "cheap" looks and sound, gen1 bolt-ons will fit gen2 midpipes on the opposite sides(logo plates will be on the inside if put on a gen2). The muffler side bolt pattern of the gen1 and gen2 midpipe are the mirror image of each other. I had a set of gen1 Two brothers on my gen2 this way before I bought my current exhaust.
DanMoto also makes nice slipons for under $200.
Slip-ons or bolt-ons give you looks, sound, and a nice improvement in handling. With aftermarket mufflers weighing a couple lbs each vs the 17lb each gen2 stockers, the bike flicks side to side through curves much better.
Hp gain may be 1 or 2, and not noticeable.
A full exhaust can give you roughly up to 10hp, and dyno tuning will make the best of it.
Full exhaust on a gen2 also eliminates the catalytic converter, which will cook your feet.