Flow American Thunder Catback

apats77 · Apr 17, 2012

I was looking at the catback on AM today and at such a great price its very attractive.

1 question though anyone with experiance know if this set up has a bad drone at high way?

Stock mid pipe w/ converters
3.73s im cruising around 2200-2400 rpm

http://www.americanmuscle.com/flowmaster-catback-98gt.html

Night Shifter · Apr 17, 2012

Shouldnt be very noticeable with the factory h pipe..

I had a little drone with an off road h and shorties...when i went to longtubes and an off road h it went away

AZmustang98 · Apr 17, 2012

Look the combo up on Youtube! There are countless videos of Mustang exhaust setups. Find your favorite.

jmc01gt · Apr 19, 2012

I have the same cat back, 3.73's and have driven it with the stock pipe...it's pretty mellow with the cats in.

usaf_branham · Apr 20, 2012

check youtube.

i will say this about the combo... my friend had an 01 GT with stock exhaust manifolds, an o/r h-pipe and the am-thun flowmasters, and it sounded awesome.

when i bought my car, the first thing i bought was the american thunder flows, it was WAY to quiet for my liking with stock manifolds and stock mid-pipe.

6 weeks later, I bought a set of bbk ceramic coated l/t's (from that same friend who ended up selling his car after he got out of the air force) and installed them with a bbk o/r x-pipe... it sounded BA, except for the rpm between 2500 and 32oo rpm... it was WAY to raspy... it sounded like it had an exhaust leak...

I ended up putting an o/r bbk h-pipe on instead of the x-pipe and it sounded amazing. no more popping and snapping. i mean it really sounded good... however, it still had that hollow sound of flows with a lot of drone around 2k and 2.5k rpm. It sounded good, but the same as almost every mustang around...

In the end, I have BBK ceramic coated L/T's, a BBK Catted X-Pipe, and Magnapacks. Its a different sound... it is loud but sounds good.

I ran the magnapacks with bbk lt's and the bbk o/r h and it sounded like a dump truck. That might be because i have a KB with 9+ psi at low rpm and the cylinder pressure may make the magnapacks sound like crap. The bbk catted x-pipe makes it sound amazing. Just my 2 cents. Again, check youtube.

Maxpowers · Apr 22, 2012

I've never heard an exhaust I would consider to be loud through the stock cats.

BurningRubber · Apr 23, 2012

I agree with Maxpowers.

Even SLP LM-1's are bearable with the stock H.

Flows have that good classic sound. They sound soooo sick with an offroad H.

AZmustang98 · Apr 23, 2012

^^^ Flowmasters with an O/R H are beastly. When I went to longtubes I switched to an X style midpipe. That being said, I am in the market for a shorty O/R H to get the bark back...

apats77 · Apr 23, 2012

Thanks guys. Think I'll be looking to buy the American Thunders soon. Sounds like exactly what im looking for.

1fun281 · Apr 28, 2012

Look into mac flowpaths, theyre similar to flowmasters, but IMO sound way deeper way better and alot less drone!

crzyhrse99 · Apr 29, 2012

Flows w the stock H is tits!, match it with an off road X and you get the wet fart sounding crap on deceleration and between shifts.

Winters98GT · Apr 29, 2012

AZmustang98 said:
^^^ Flowmasters with an O/R H are beastly. When I went to longtubes I switched to an X style midpipe. That being said, I am in the market for a shorty O/R H to get the bark back...

That is exactly my experience with Flow's on my 2v's with different mid pipes/headers. Hated the x pipe with them.

Gears will really help the drone level when cruising. With 3.73-4.10's, you can basically take out the drone on most exhaust setups at 70mph.

sneaky98gt · Apr 30, 2012

FWIW, Flowmasters + Offroad Prochamber is where it's at.

Mossberg · May 2, 2012

sneaky98gt said:
FWIW, Flowmasters + Offroad Prochamber is where it's at.

cosign, but I'm biased....

DarkFireGT · May 3, 2012

sneaky98gt said:
FWIW, Flowmasters + Offroad Prochamber is where it's at.

I just replaced the rusty off/road X and Edelbrocks that came with my 02 when I bought it with this combo. I love the sound, but it's too dang quiet. I know I'll eventually end up changing the mufflers out. Maybe it's because the former combo was crazy loud, but this just seems too quiet.

1fun281 · May 4, 2012

This is UPR offraod X with flowmaster american thunder catback

Flow American Thunder Catback

apats77

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Night Shifter

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AZmustang98

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jmc01gt

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usaf_branham

Maxpowers

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BurningRubber

AZmustang98

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apats77

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1fun281

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crzyhrse99

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Winters98GT

Whoop...whoop-whoop-whoop-whoop...GANGNAM STYLE!!!

sneaky98gt

Mossberg

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DarkFireGT

Playing with my wife's really makes me want one.

1fun281

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Flow American Thunder Catback

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Whoop...whoop-whoop-whoop-whoop...GANGNAM STYLE!!!

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Playing with my wife's really makes me want one.

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