I didn't know there was different 40 series. So, I ended up getting the originals. Does anyone have experience with them on stock GT exhaust? Are they loud or the same as the 40 super?
Original 40 Series Flowmasters
- Thread starter MGSTANG
- Start date
nickthegenius
Active Member
There are original 40-series, Delta Flow 40-series, and the new Super 40s. I know that the Delta Series is marginally quieter than the originals, but I haven't heard the new Super 40s yet. I know that the Supers are supposed to have the same basic sound, but are supposed to not have the drone inside the car. Nonetheless, the original 40s sound great if you like the chambered sound.
i have been planning on getting the American Thunder cat back systeem that come with the original 40 series. when i recently went to the flowmaster site they only had the 40 series delta flow with the American Thunder system for my car (2001 GT) and they were almost $200 more than last time i checked (like 2 weeks ago) What is up with that and can i still the American Thunder Cat Back with 40 series original mufflers????
hognutz
New Member
the new delta's have a little extra baffling in the inlet. they are still 2 chamber. they still drone alot. Have them on my blazer. If you don't like drone I would go 50series. have those on my chevelle. lot nicer on the ears wile driving still scream when you get get all over it. I used to love 40 series until I put them on somthing I drive every day. Now I hate them. I have to say. If you still have all your cats I don't think you will notice much difference. It is almost imposible to make a car "loud" with 4 cats on it.
StangLou
Active Member
It cost me $50 bucks to get both of mine welded in. The guy has done work for me before and is very reasonable with Mustangs, so this might not be the most accurate price estimate for you but its something 
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