This is really not for the hard core racing mode guys...because you guys will just tell me not to do this im sure...but here is my question:I just want to buy a nice racing muffler..for right now...and then take it to a shop later and have them make a phatter tubing than the oem exhaust that is on there now....would this work just as good as buying the whole expensive cat-back systems...or at least will help right????/