on my way home from work today, i pull up next to a late 80's camaro, we both go for it,and i smoked him from the start. when i get up around 85 or so, i look back and see hes about 5 carlenghts back so i let up of the gas,and BANG!! wicked back fire. car ran smooth the rest of the way home. how bad can this be or is no big deal. i do have an o/r hpie and flows if thats any help.