03GT_4.6

Will I see much more of a gain with a full Magnaflow catback (not magna pack) system vs. just having some Flowmaster super 40s put on? Is it worth the extra 250-300 dollars for the whole cat back? I also plan on puting on a CAI very soon also.

Aixtreme89

F*ck flowmasters, you can have mine.

gouldie1903

i got the super 40 catback i think it sounds amazing but is not as loud as i wanted.

II 98 GT II

If your interested in getting the most hp/dollar, then buy the cheaper flows and pickup something else... you could almost buy the flows+CAI for the price of the magnaflows...

40thGT

anyone know how loud the AMerican Thunder Cat back is from Flowmaster? louder then stock atleast?

03GT_4.6

That is what I was thinking. I'm thinking about a K&N FIPK and I like the sound of the Super 40s. More mellow than the 40 but louder than the delta 40. I put two 40s on the 97 Olds Aurora I had and it sounded awsome, as of right now I'm partial the the flowmasters.

40thGT

anyone hear the American Thunders? ?

03GT_4.6

If you go to www.flowmastermufflers.com you can hear sound clips of their mufflers.

SXGT

your car wont be loud unless you get the mandrel bent , larger cat back pipes. i also suggest an O/R pipe cause thats where the restriction is.

03GT_4.6

What is the diameter of the stock exhaust on an 03? Also, I don't know if I want my car to be really loud. I like a more deeper mellow rumble.