ok im looking at exhuasts for my 05 katana 600 i ran across this scorpian exhaust that claims you dont have to jet your bike to put it on. is this possible or just a load of **** to get you to buy it
EFI bikes compensate to some degree, making a remap less fruitful than a rejet. Again, I didn't say you MUST rejet, just that you make more power if you do.