96 TBird 4.6

im sort of confused about the flowmaster american thunder cat-back. is it just the name of for cat back or is it louder than the regular 40 series? anyone with this system know?

87GTHO

I thought magnaflow was the american thunder system?

bobby

american thunder is the 40 series. SAME THING. theres the 40 series 2 chamber(american thunder whichc i louder) and then 40 series delta flow(quiter) magnaflow and american thunder(flomaster) are to completely different coimpanies

Quik

actually the first american thunder systems like i got are actually 50 series 2 chambers not 40s

there are 40s and super 40s. super 40s are the basic louder ones.

Bkizzle

Super 40s are the quieter ones, original are louder right... i have super 40s now and i think im gonna switch to original or slp

stanglx2002

look at this post if you are looking for new mufflers

https://mustangforums.com/m_563626/tm.htm

Quik

Hot Rod sound and more horsepower.
These Super 40 mufflers from Flowmaster significantly outflow the older two chamber mufflers. They help create even more horsepower with less interior noise and a deeper exterior sound. These mufflers feature a design patterned after Flowmaster's race mufflers, with a classic black case. These mufflers far exceed older models on Dyno tests. They create a beautiful hot rod sound, along with increased horsepower and gas mileage.

More power, less noise.
Looking for the most aggressive sound in the Flowmaster line? Then take a look at these 40 series mufflers. Designed for use on street and strip vehicles, they take the sound waves produced in the exhaust, and cancel them against angled baffles built into the muffler case. This improves both horsepower and fuel economy. Best of all, they allow you to hear that cool Flowmaster tone inside the vehicle, as well as outside of it.

87GTHO

Who makes the ultra flow ss mufflers that are ranked the highest on that chart?

MrFedEx503

I love my 40 series, they sound mean, people know when i'm comin.

stanglx2002

Dynomax