I would like my vtx 1300 to be a little louder. can i drill a small hole in the back of the muffler to make it louder will this work any pros or cons please

Honda mufflers typically have several baffle walls You may need a drill 14 or more inches in length to punch through enough of these walls to make a noticeable difference. Changing the back pressure of the exhaust will also lean the mixture. This may cause a bad hesitation on take off. This will happen if you change the exhaust system also. To correct the hesitation you may need to install a jet kit on a carburetor model (about $100) or install a Power Commander on a fuel injected model (about $400 plus programming). In both cases your fuel economy will go down. Your stock system has a five year warranty, should not blue like an aftermarket pipe (unless you leave the choke on too long), and have a good long service life. Unfortunately there is no easy solution for your problem. Any aftermarket system will be way to loud (especially on the freeway) and drilling may not give you the desired sound you are looking for leaving you angry and frustrated. Consider a different option, One of the best sound options I have heard was a set of stock Harley pipes adapted to a Yamaha Virago 1100. Most Harley riders change out there exhaust systems before they even ride there bikes which should offer a cheap high quality system that can be adapted to your stock headers with common automotive adapter pipes and custom build it yourself supports (a simple modification of your stock pipe support/mounts). By not damaging your stock system you can always put it back on if you do not get the desired effect.

I have a '06 1300 with stock pipes. Didn't want to invest in after market pipes and most are too loud. Used the clayton mod. Drilled 6 -1/2" holes in the back of the muffler, only needed about a 6" bit, and it made it noticeably louder. No need to rejet.