103 is a stroker with big bore cylinders, 95 is a big bore
Lots of posts on web boards all over the net.
Best thing is to decide where and how you want the power, a hot 95 will smoke a showroom 103 SE bike.
If you want a good combination
SE High Flow air filter kit or Ness Big Sucker
95 Cylinders (bore your 88's out)
95 Flat top pistons (HD 9.5 to1)
Andrews tw-37B cams
Send heads to
www.motorcyclemachine.com (Short Block Charlies) $300
Exhaust, change to better flowing slip ons, Hooker, Khrome Werks, V&H
Powercommander or Race Tuner for EFI (depends on bike year)
If carb, CV44 and big bore intake (Includes SE High Flow filter kit)
Get it dyno tuned
Should do 100/100 or close and work really well on the bagger.