Hey, noob girl here. I've been looking at all kinds of catbacks online and at the local shop... but all the tail pipes on them are grapefruit shooters... like 4". I want a catback but I only want a 3" tailpipe. I've been able to find a few axleback's that are 3". Am I going to notice a huge diff. between the axleback 3" and a catback 4"? A lot of HP? What about the sound? Let me know what I should do. :driving: