hey guys few questions about my truck. first i have a 2003 1500 qcsb with 5.9 v-8. want to replace stock muffler what is best one flowmaster or dynaflow. dont want it real loud but do want to hear nice growl. i have already replaced stock air filter with k&n is it worth it to get cai for mpg and hp gains. Do the airaid intake spacers work for mpg or hp. What are the best plugs and wires for my truck. Should i replace the stock distributor for a performance one. Thanks for any help you can give me. this is the first dodge ive ever owned i used to be a blue oval guy.