My friend and I got ourselves some yoshi rs3 race bolt on cans. While we were riding at night I noticed my friends bike backfiring while he was slowing down in gear. Is this normal? He called the local suzuki shop and asked them about the problem and they said something about he probably needed a powercommander because it seems that the bike may be running a little rich. I thought you only needed a power commander with a 4 into 1 system. Is this something to really worry about or am I just being paranoid? Thanx all! BTW we both have 02 models.