First mod is to buy a Stoltz bow roller as the stock hard plastic one can mark up your boat pretty bad even on the first few times out. The stock stereo is ok but it's not going to boom or anything like that. I don't have a big stereo or anything. I think the 195's came with a different stereo than the M505 mine came with but I'm not certain on that. If the 195 does come with a different radio get a RF remote for it if it can take one. That way you can keep the glove box shut and still operate the radio. SeaDek is a GREAT mod and would for sure be on my must do list. Not having to take out the carpet after each use and dry it saves a ton of time when it comes to put the boat up. If you boat in a river with current you may want to get some trailer guides. I went with the C.E. Smith 60" with LED's on top. Those make landing the boat a breeze. Since you're looking at 195's they already come with the nicer intercooler and performance parts so you're good to go there unless you want even more power then you'll need to look into a tuner, larger SC wheel, etc. A blowoff valve isn't necessary however it will prolong the supercharger clutch life when you shut off the throttle quickly coming from boost. Other than that I would just farkle the boat out with whatever you want. You'll also want to get a battery tender or onboard charger. I use an onboard one made for a single battery setup. When/if you go to buy a boat have the dealer sweeten the deal by throwing in items such as ropes, dock lines, fenders, anchors, life jackets, USCG kits, etc. most dealers don't really budge from MSRP a lot on a new boat but best time to get one is usually around the boat show deals. Yamaha also does zero to low interest financing during that time and early spring.
One other thing I would mention is I also bought a rear seat hatch conversion kit from
@JetBoatPilot which makes my rear bench seat have a padded step thru instead of cushion all across. That way I'm not walking on the cushions all the time when I enter/exit the boat. It's my second favorite appearance mod next to SeaDek and it also adds in safety as you will have surer footing than on a cushion. My wife and daughter really likes this.
View attachment 67529