i am new to all this so sorry if i am asking a stupid question but, which exaust is better, the racing one on racing beat(the street legal one) or a catback exaust? and are both of these street legal and how much more hp does these give you, any expierence on other things with either of these would be greatly apreciated

 

a cat back isn't going to do much, considering that the cats are what rob uer 7 of power, so a racing beat system would do better in gains.

HP numbers are a dime a dozen, every car is diffrent so until you dyno it you will never know how much horse power you'll get... but RB is deffinatly better of some cat back