So after thinking about this for a while i decided to do it ,
At exhaust shop they sugested a 2.5 inlet 18" glass pack,,,
Now what i did not know is the inside of the glass pack is only 2"
does anyone know if this can cause too much back preasure or reduce perfomance?/?

Ok results after replacement: Its loud,,,,almost too loud,,,car makes lots of low end growl,,,sounds like an old muscle car,,,,,im not sure if i like it this loud,,,
I do have a streaight thrugh muffler that i also replaced,,,,so im thinking maybe to go back to a stock muffler,.... to make it less noisy,,,,
no rasp at all,,,but defenetly a lot of low deep growl,,,,,

 

glass pack is filled with fiberglass If I remember correctly

 

yes around the outside,,,but its streight trueugh, u cna see trugh it accept it sonly 2 "
so thats my concern