Look at Wilkinsons's new stainless system. He fixed the issue of the stock mufflers killing 50hp.
They look and fit like stock.
If your engine is stock, you want to stay with something like this since you will not benefit from anything fancy(er).
Realize that any change also will change the sound of the exhaust, i.e., louder. The system is so short there isn't much you can do with that though.
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