My friend giving me a free flow magna flow 2.5" muffler to install on my R for the event coming up ..sould i slap it on wit a custom 2.5" madrel bent pipe w/test pipe ,and dc sports 4-1 headers..Will I gain anything out of those mods i am goin to put on my R motor trying to break 13s wit a fully gutted car this time and a better track..Will this muffler help + pipings?plmk..thanks