Okay I have an 87 camaro z28 with a little modifications its equipt with a chevy 350 bored .30 over to be a (355) it has edelbrock everything carb., airfilter, manifold everything i just put on new shorties headers and im about to have a full exhaust system built my question is im putting on flows what series should i go with at the moment i have been told 80 series and now im being told 40 series what would be the best i want a loud grumble that will sound mean and amazing what should i go with i need to know by monday please and thanks