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FS: hx 720 to 787 motor conversion bracket

That will be crazy fast, good luck with the project. The bracket looks like it will raise the motor a bit, do you have to modify the seat to get it back on?
 
No you don't have to modify the seat for the install. You have to use a Neptune or Coffmans rec or race pipe with this setup. You can not use a stock pipe with it, but you might would be able to dent a spec 2, but I can't guarantee that would work. A friend of mine has dented up a spec 2 Factory pipe pretty good and got it to work.
 
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