Morning all, having bought another v85 to replace the one my lovely lady commandeered within 24hours of getting it home I have a couple of questions about modifications. Itās my 6th Guzzi in about 40yrs so I am used to their ācharacterfulā habits, 
. The first thing I have noticed on the v85tt that I test rode and then the one my girlfriend has and now mine is how incredibly hot the cat and engine get. I am old school and back in the day, that much heat would have been seen as detrimental to longevity. My thoughts are that the resistance to the exhaust gas running through the cat is responsible. So my question is.
If I remove the cat and replace it with a new exhaust, will the sensors in the header pipes pick up any change in the exhaust gases and cause the ecu to correct the fuel ratio to compensate? Also, would the Mistral v boost plug smooth out the low speed throttle response? I am not looking to increase performance, on the other hand I donāt want her running like a dog either, just to give the engine an easier life through cooler running. My choices are;
Mistral v-boost plug with standard exhaust.
De-cat with standard silencer and v-boost.
De-cat with Mivv Storm silencer and v-boost.
I have looked on line and there are so many conflicting opinions so I would be interested in actual experience of the above rather than just conjecture. Apologies for the long post.
Just to make it more interesting, below is Elaine on her V85TT and āGooseā my replacement for the one she now rides. 
nice series 2a at the back there too.
i added v twin boost and āvelocity stackā, followed a few months later by mistral downpipes and y piece, with standard exhaust. a couple of months later i added mistral silencer
best thing i ever did, they run so much better you wont want to go back to the standard exhaust.
one word of warning, torque the belly pan guards before you add thread locker, it does need thread locker as the bolts can rattle loose, but adding it on the threads first messes up the torque rating and if the mounts snap off the down pipes youll need them tig welded back on.
you dont need any remap, it adjusts the fuel mix based on the standard map with info from the lamda sensors, and adjusts this automatically with the new pipes.
This sounds like the solution to my low speed lousy running, ive even debated about changing bikes but i do love my v85tt, so i may after its out of warranty dump the down pipes and cat, add the velocity stack and see how it goes 
Thanks. That is pretty much in line with what I suspected. I have ordered the Y piece and silencer as well as the v-boost. Will look at the velocity stack as well.
One thing at a time would be my view. My 2020 has never felt lumpy except on cold starts for about 10 seconds. The cat went first - weight and access to drain plugs mostly - then the exhaust. Mistral v twin boost; not convinced about spoofers which mostly just con the ECU into running rich. Peopleās views vary but having spent 150 sovs thereās a powerful incentive to believe in it.
Modern engines run very close to detonation, so they do get a bit hot, also modern fuels cause engines to run much hotter
is your motorcycle new ? if so the increased friction from running in all the new parts will increase heat build up
if its under warranty then any messing about with the exhaust system might leave you short of pennies if it goes wrong
mine has been on about 18 months and over 10k miles without problems.
it runs cooler now than before and much freer flowing
Not new. Itās a 2022 model with 1750 miles on the clock. Back when I was running carbā bikes in the ā80ās a lean mixture always led to a hot running engine. I know modern engines are designed to run lean and presumably, they run hotter as a consequence. I canāt help but feel allowing the engine to get rid of hot exhaust gasses more freely, the engine will run a bit cooler.
Iāve had my ā23 V85 about a week and managed about 300 miles on it so far in between this awful weather.
It already has Mistralās VTB installed but to me it still feels a bit lumpy,
especially around 2500-3000 rpm.
It runs hot but still only has 1900 miles on it so running in is a factor.
Like Inspectorman Iām going to change one thing at a time starting with the velocity stack.
After the warranty expires Iāll fit Mistralās wider bore headers and Y pipe which is freer flowing and should be smoother running.
Iām going to make all Mistral modifications as they should work together. Mistral are also just down the road from Moto Guzzi, have a good relationship so should work well.
probably 6 to 7 K before it loosens up properly
I know my Breva took a fair while, and I am not gentle with it !