Hi there. Are you looking to just make your bike louder or are you looking for performance? running straight pipes on a Honda V4 is not recommended as you will have a very hard time getting it jetted properly throughout the entire RPM range. If you are looking for something a little different there is a company called Laser who make headers for the V4 hondas. As well you can look to either Mac for replacement mufflers or Kerker for a 4 into 1 exhaust system. There are not a lot of options for the V4 hondas, and I think for the V45 you are pretty limited. Best bet is to keep an eye out on ebay. Another great source to checkout is www.v4hondabbs.com. Lots of knowledge on the V4s as well as a section classified section. Running a 4 into 1 system is your best performance option.

And always good to meet another local V4 owner. I ride a '84 V65.