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..