how big of a job is it to fit 54mm system, do i need to program the ecu at a dyno ctr for it top work as standard. i know it will need setting up professoinal to get the best out it. im spanner handy but i dont want to drop a bolla. riders seat is it held down by a nut under neath the seat unit many thank ps eggsauce should be here next week,with new suspenders brembo brake lever wheels etcrrr hope the wife turns a blind eye