anyone that has modded your exhaust experiencing extreme fumes in the cab? I only eliminated the factory "kitty" from my muffler. Since then the exhaust seems to be very "rich" and is causing issues for passengers and anyone that rides behind it. made the wife so sick in the passenger seat she was vomiting. I see one person below had a similar issue.

Side note, Ive added an aftermarket one way valve on the fuel tank vent line AND tightened the fuel pump lock ring but it still smells like fuel also.

Im not sure if this is all one problem or two separate issues at this point but kids are refusing to ride double in it until I get it sorted out.

[2015 Z Force 800 53/Trail EPS]

If the exhaust fumes are that rich then there is something going on with the engine or maybe a leaking injector and that would have wasted the catalytic converter. These normally run very lean so..need to look into that as well as the exhaust donuts(gaskets)and springs. Leaking on any of them will send fumes into the cab. As for the gas smell, have to inspect every inch of the system and tank for wetness. Might even see if the tank will hold pressure...and if the new valve lets air in when pulling air out. Also make sure the muffler is free-flowing. Not sure how you got the converter out of it but maybe there is something still there that's offering some restriction.