Hi I own a yamaha yzf r125 and want to get a better exhust on it but I'm so stuck on what to get as I herd the scorpion has a cat but I don't want one with the cat but don't have to much to spend and don't wana have to get it get all remapped and all the fuss some one please help. Cheers
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comes up a lot and the general consensus after long debates is usually save the money for a bigger bike.
insurance - may cost you more with mods
legality - if it ups the power it may invalidate your insurance as well as having you driving otherwise in accordance with a licence (assuming you don't have a full licence). If the cops decide this they'll take your bike. If it's not E marked then you can get a fine regardless.
affect on bike - as you've stated, it's unpredictable and could cause flat spots as well as other issues.
Possibly harder to sell as people usually want a clean original bike as messing with it can cause the problems above.
Just save the money - seriously. Spend it on a bigger bike. I almost went down the 125 mod route and I'm glad I didn't as the cost really does outweigh the negligible returns.
If you want more speed, learn to ride it faster