i traded my homie my stock ls exhaust for his aftermarket muffler, and dude the sound is much different the car feels faster to me but it's just intake i don't have the full catback or anything just welded it on

 

the extra noise probably makes you think its faster just because its louder.. That happens a lot.
and your post is kinda hard to understand.

 

oh my bad dude i was typing way too fast but yea it's probably better then my stock muffler

 

wow.

 

just your butt dyno, how much did it cost to weld?, you should have done your entire catback, at least you get some power out of it other than just a deeper tone

 

20 bucks