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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 03-22-2012, 03:55 PM   #1
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Flowmaster American Thunder

I just ordered a Flowmaster american thunder cat back exhaust system for my car. I must say it is hard to tell what its really going to sound like by listening to all the clips and stuff I dug up on this site and y tube. Does anyone already have this installed and how is it. I dont want super loud, but i do want the low rumble at idle and some nice deep rumble when i get on it. But i hope its a little quiet when just loping along and doesnt attract too much attention from the fuzz.
Some opinions are welcome, but I dont want to hear I should have bought this or should have bought that because i did listen to at least 100 different exhaust clips from all the manufacturers and think I like the Flowmaster sound the best. Thanks in advance
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Old 03-22-2012, 04:12 PM   #2
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It's not a bad system at all. the AMT is called thunder for a reason. It won't be SUPER loud unless you have long tube headers, but should give it that rumble that you want when you get on it.
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Old 03-22-2012, 04:24 PM   #3
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Based on your desires, I think you will love it. There are times when I wish it was louder at lower RPMs but it has a great idle sound and WOT sound.
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Old 03-22-2012, 04:26 PM   #4
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yea its not to loud a friend of mine has it with longtubes and its not even too bad love the deep throaty old school sound
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Old 03-22-2012, 04:38 PM   #5
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My Flowmaster with long tubes gets pretty loud when I stomp on it, and I have the hush power system which is quieter than the AMT.

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Old 03-22-2012, 05:52 PM   #6
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I have it. It sounds a notch louder than stock at an idle (with no headers). The first time I started it up after the install, I was initially disappointed, and I looked at the tech guy and said "they should have just came this way..." and he laughed and agreed. Now, if you put headers on... its a whole different beast... but its still not as loud as some other exhausts out there.
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Old 03-22-2012, 06:02 PM   #7
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[QUOTE=Mindz;4689392]My Flowmaster with long tubes gets pretty loud when I stomp on it, and I have the hush power system which is quieter than the AMT.

Great burnout on the orange one.. But what happen after??
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Old 03-22-2012, 06:10 PM   #8
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Quote:
Originally Posted by Chiefish View Post
I just ordered a Flowmaster american thunder cat back exhaust system for my car. I must say it is hard to tell what its really going to sound like by listening to all the clips and stuff I dug up on this site and y tube. Does anyone already have this installed and how is it. I dont want super loud, but i do want the low rumble at idle and some nice deep rumble when i get on it. But i hope its a little quiet when just loping along and doesnt attract too much attention from the fuzz.
Some opinions are welcome, but I dont want to hear I should have bought this or should have bought that because i did listen to at least 100 different exhaust clips from all the manufacturers and think I like the Flowmaster sound the best. Thanks in advance
LIKES: I dont have headers yet... I do have the Thunder 3 inch cat back kit and it sounds very muscle car like. General driving its a nice little rumpity sound...a generous squeeze and you can hear the cylinders fire...thump it and it opens right the F$#^ up!

DISLIKE: (Automatics ONLY) only one "Active Fuel Management"..get it programmed out..OMG it will make you nuts.....On the highway at 65 it sounds and feels like your riding the rumble stip.

I think some SOLO free flow cats would make it that much sweeter out the back!
Here ya go one more vid for ya LOL
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Old 03-23-2012, 05:35 AM   #9
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Sweet, I should have it by tuesday and ill probly install it the following weekend. I must admit Im a little excited to start making this car sound like it should. I appreciate the feed back and when I get home tonight ill check out the vids you guys added here. This darn firewall wont let me see any during work hours lol.
Ill try and do a before and after clips for others to check out too.
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Old 03-23-2012, 06:18 AM   #10
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I have it and love it. Its as everyone says... but I have headers and had them first so I really have no idea what it sounds like with factory manifolds. I dont think its loud at all... even with headers. It just sounds mean. Here are a few clips to to confirm you made the right choice.

Now, I will say... you get what you pay for. The pipes are stainless, the mufflers are not. They will eventually rust but whatever, the whole kit is like $600. I would still choose the A/T kit 10 times out of 10.





not my car but a great video...

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Old 04-04-2012, 06:42 AM   #11
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Thanks for all the input guys, I got my system a few days ago and got it all installed. No real problems to speak of other then the fact that I dont do exhausts every day so it took me three times up on the lift to get all the pipes lined up good and not rubbing anywhere. First time I thought i had to shim the tunnel brace so I used some washers and did that, but even with an extra inch of clearance i still had banging, went back under and used a jack to push up on the x pipe as I tightened the fisrt clamps off the cats and that problem was solved. No spacers needed at all. The third time I had to pull the aluminum heat shield down a bit off the driveshaft to stop it from rubbing on it as it spun. I guess I pushed up the x pipe a bit too much and distorted the shield a bit. Once i got that fixed it is as good as gold now. Sounds great , looks great and Ive already seen my fuel mileage go up a few tenths.
Next i have my Vararam intake coming and should be here tomarrow, I cant wait to see how that feels and sounds with the better flowing exhaust.
Well I just wanted to thank everyone for thier input it made my decision making much easier with some real world input.
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Old 04-04-2012, 10:16 AM   #12
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Quote:
Originally Posted by Chiefish View Post
Next i have my Vararam intake coming and should be here tomarrow, I cant wait to see how that feels and sounds with the better flowing exhaust.
Well I just wanted to thank everyone for thier input it made my decision making much easier with some real world input.
After the Vararam should be headers and a tune!

I had my AMT system put on my 2011 L99 about 3 weeks after I bought it. It really did sound great, but I got my Vararam, ARH LT Headers with cleaned out cats (shhhh don't tell MD MVA!), and tune about a month and a half ago, and all I can say is "WOAH". It's a lot louder when driving and WOT sounds RIDICULOUS, but it will still calm down and smooth out at low rpm so I can order at a drive-thru window haha. Cold starts are loads of fun
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Old 04-04-2012, 10:33 PM   #13
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Quote:
Originally Posted by Chiefish View Post
Thanks for all the input guys, I got my system a few days ago and got it all installed. No real problems to speak of other then the fact that I dont do exhausts every day so it took me three times up on the lift to get all the pipes lined up good and not rubbing anywhere. First time I thought i had to shim the tunnel brace so I used some washers and did that, but even with an extra inch of clearance i still had banging, went back under and used a jack to push up on the x pipe as I tightened the fisrt clamps off the cats and that problem was solved. No spacers needed at all. The third time I had to pull the aluminum heat shield down a bit off the driveshaft to stop it from rubbing on it as it spun. I guess I pushed up the x pipe a bit too much and distorted the shield a bit. Once i got that fixed it is as good as gold now. Sounds great , looks great and Ive already seen my fuel mileage go up a few tenths.
Next i have my Vararam intake coming and should be here tomarrow, I cant wait to see how that feels and sounds with the better flowing exhaust.
Well I just wanted to thank everyone for thier input it made my decision making much easier with some real world input.

I had the exact same problem with the rubbing against the exhaust shield. I was like WTF and finally figured it was the driveshaft and heat shield. I still have a very slight tapping I can barely hear that needs bending.

I originally had the AMT, it sounds like what you're looking for. However, it wasn't near loud enough for me. I ended up switching to the Outlaw system
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Old 04-05-2012, 06:11 AM   #14
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I have my Flowmaster AT along with TSP long tube headers. It sounds like a shotgun when you first turn on the car but quiets down to a nice rumble after.

I was afraid when I installed my long tubes that it would be too loud but was not. Now, when you step on it that's another issue, people will definately hear you blocks away.
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Old 04-05-2012, 11:32 AM   #15
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I had this exhaust with both factory manifolds and now with headers. With the factory set up it gave it a deeper tone over factory and sounded way better, but I tuned my AFM off. After putting the headers on ... it got deeper and the sound is great. I have had good compliments on the sound. Had the exhaust for a little over 2 years now.

Quote:
Originally Posted by AiRDawG View Post
After the Vararam should be headers and a tune!

I had my AMT system put on my 2011 L99 about 3 weeks after I bought it. It really did sound great, but I got my Vararam, ARH LT Headers with cleaned out cats (shhhh don't tell MD MVA!), and tune about a month and a half ago, and all I can say is "WOAH". It's a lot louder when driving and WOT sounds RIDICULOUS, but it will still calm down and smooth out at low rpm so I can order at a drive-thru window haha. Cold starts are loads of fun
OHHHH Im telling!!!! LMAO J/K
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Old 04-05-2012, 07:39 PM   #16
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Somewhere here is my Livernois link that includes a video of my car with long tubes and the American Thunder. It sounds glorious. Excellent choice.
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Old 04-06-2012, 12:33 AM   #17
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I HAVE IT ON MINE.. ill say its pretty good rumble and sounds like a true muscle car.
Quote:
Originally Posted by Chiefish View Post
I just ordered a Flowmaster american thunder cat back exhaust system for my car. I must say it is hard to tell what its really going to sound like by listening to all the clips and stuff I dug up on this site and y tube. Does anyone already have this installed and how is it. I dont want super loud, but i do want the low rumble at idle and some nice deep rumble when i get on it. But i hope its a little quiet when just loping along and doesnt attract too much attention from the fuzz.
Some opinions are welcome, but I dont want to hear I should have bought this or should have bought that because i did listen to at least 100 different exhaust clips from all the manufacturers and think I like the Flowmaster sound the best. Thanks in advance
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Old 04-06-2012, 12:34 AM   #18
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Originally Posted by clarkshome View Post
I have my Flowmaster AT along with TSP long tube headers. It sounds like a shotgun when you first turn on the car but quiets down to a nice rumble after.

I was afraid when I installed my long tubes that it would be too loud but was not. Now, when you step on it that's another issue, people will definately hear you blocks away.
agree!
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Old 04-09-2012, 12:13 AM   #19
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its not super loud.




HEHEHE JK!
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Old 04-09-2012, 08:30 AM   #20
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I just installed my Flownaster AMT this weekend. I was up on the fence as to which kit I wanted, but decided on Flowmaster. IMO it is a well constructed kit and sounds awesome, not too loud and not too quiet. I'm not into that raspy sound that other exhaust manufacturers are known for. I have used Flowmaster on a majority of my vehicles and have no complaints. My prostreet Chevy truck has a 12.5:1 Big Block with two chamber Flowmasters and is pretty loud. I think you made a wise decision. r
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