PAIR is on every VTX is is an emissions thing, leaving it on the bike or removing it doesn't hurt either way.I have a 2007 VTX1300C that was bought in Louisiana, i just finished putting on a set of V&H Cruzers. I fired up the bike, sounds good, but backfiring on decell and it's dark outside, so i can see it shooting a flame out the back when it backfires. I understand that my carb will need to be adjusted, but is there anything i should know or do before moving forward ? And will this harm my bike in any way driving it to see how it performs on the Highway and do all VTX models have the pair valve, as i have read that only the California models have them...Any and all help is appreciated, love this site, very informative, with lots of great people here..
Our bikes are liquid cooled you do NOT need to rejet for pipe changes, small tweak of A/F screw should be all you need.
You did remove old exhaust gaskets and replace with new right?
Your exhaust acorns are also possibly bottoming out before getting tightened properly causing exhaust leak which will cause backfiring and stuff.
Use washers under acorns or just replace with some normal nuts that won't look as pretty but they get tight.
Welcome to site you might want to put a thread in the intro section with pics when you can, we like pics.