RPM WS6

iTrader: (3)

Looks like that thread was about muffler replacement only. That's not the same as getting the full catback. The 80-series replacement muffler is only a 3" in, dual 2.5" out muffler - the AT catback uses a 3" in/dual 3" out muffler (or at least it did when I bought mine many years ago). Also, by getting the full catback you're getting a bigger I-pipe and improved bends. I absolutely can't believe that anyone has ever installed the entire AT catback and *lost* power over their stock LS1 catback (dual/dual excluded).

The other way to look at this is, "Do you want an exhaust note that you're happy with 100% of the time on a street car, or do you want to make marginally more power for the 1% of the time you're at WOT?"

777

iTrader: (21)

You're the first person I've heard say this. I always new magnaflow was quiet but I thought the aerochamber was louder than the flowmaster. Sound is very opinionated. I have the same exhaust as you speak of (weld-in flowmaster) that sounds like crap and I think it sounds fine. Then again most seem to like borla, which I can't stand.

I liked my exhaust on my old 98 cammed formula, it's just that it was too loud. Dumped true duals with sweet thunder 3" mufflers.

RPM WS6

iTrader: (3)

Agreed on all counts.

blknSS

Go with magnaflow. Great system for the money. Mods are in sig.

Bugsy

iTrader: (1)

Exactly. It all comes down to what you want/prefer. A few years ago, I bought a Fox Body 5.0 that had Flowmasters. Inside of a week, the Flowmasters were gone, and replaced with Borlas. To some, the sound of Flowmasters is pleasing. To me, they are simply noisy. With both the Magnaflows now, and the Borlas then, I had both the power AND a sound I like.
The point I was attempting to make for the OP, was that liking or disliking a particular system's exhaust note is a matter of personal preference. But, barring cutouts, he will be sacrificing power by going with the Flowmasters over many of the other popular brands. It's basically a decision he's going to have to weigh for himself. For me, I'm glad that I found an exhaust that allows me to have my cake and eat it, too!

Sales3@Texas-Speed

iTrader: (2)

Personal preference will obviously be the deciding factor, but for some reason the LS world isnt fond of the "Flows" like old school guys... It think that our rumbler cat back offers a sound similar to that old school sound, but we definitely dont use a flowmaster.

JP95ZM6

I tested a Flowmaster for HP loss. I have a 3" exhaust and a Flowmaster 80, with LTs, Y pile, and an electric cutout under the rear seat. Car is an LT1 383. First run open cutout, 2nd run through the FM80. 12 HP loss out of 417, less than 3%, not too bad. I don't know what a stock system costs for HP. Mustang Dyno BTW.





Personally I love the sound of the Flowmaster 80. Here's what idle sounds like; this is too high an RPM to hear the cam lope much, 750 sounds a lot cooler, but you can get the idea.

http://s154.photobucket.com/albums/s...000rpmidle.mp4

RPM WS6

iTrader: (3)

Agreed.

No matter how many people profess their love for Magnaflow and Borla, there will still be those of us that prefer Flowmaster. Sound is all opinion anyway, so there will never be a wrong answer in this regard.

For a street/strip application I would simply do a cutout for track events.

For a race car I wouldn't even consider a catback; too much extra weight and pipe bends. Headers with duals ending mid-body. Add a couple of race bullets if your track has noise restrictions.

LASTOFTHEBREED02T/A

iTrader: (15)

I made the mistake of going 80 series Flowmasters when i first bought my TA, I felt no difference at all other than a bit more rumble vs my stock exsht.

But i do have to agree with Post #8 If you want good flow, add a cut out. I did it to my exhst and always leave it open! Some ppl down the street give me dirty looks all the time, but it sounds awesome IMO. After the cut out, i never bothered replacing the flowmaster, its there for when i close the cutout for long trips or normal sound.


Stay away from Flowmaster, theres alot more options out there that you'll be happy with.

JD_AMG

http://m.modmotortech.com/forums/sho...0&postcount=33

homerz28

Don't forget, many companies make systems for our cars. MAC and Pypes are two no one ever mentions on here. I've had FM80, LM 1, and Pypes myself.

MonmouthCtyLS7

iTrader: (6)

Saw a muffler comparison a few years back and Flowmaster was right at the bottom.

FASTFATBOY

iTrader: (23)

The crossflow muffler on our cars is what sucks, and the Flowmaster crossflow muffler "seems" to be among the worst.

On a mildly modded car the factory pipe flows VERY well with a single in/out muffler on it.

On my car I only picked up 5rwhp going from the stock pipe with a Magnaflow single in/out muffler turned down under the drivers side bumper to a SLP 2OTL.

This was making 385 to the wheels.


EDIT

On my 1992 Silverado I went from a 70 series Flowmaster with a dual 2.5 inch inlet/single 3 inch outlet to a Magnaflow with a Flowmaster Merge and only picked up 4 to the wheels.

The single in/out Flowmaster mufflers do ok.

RPM WS6

iTrader: (3)

This is what I've been thinking about doing lately. A FM Super 44 3" single in/out with a turndown tucked up near the driver's side frame. This should look fine on a Camaro or Formula since they don't have any tail pipe provisions in the bumper anyway. If I use a muffler with offset inlet/offset outlet, it should fit in the stock location and be able to be connected to the stock hangers.

54inches

iTrader: (4)

Agreed. 100%

I have used Flowmasters since about 85; met Roy in 87 when nearly no one knew Flowmaster.

I am a diehard fan and the "tests" that I have seen are negligible.

Crossflow sucks whomever makes it.

Flows and cutouts is priceless.

FASTFATBOY

iTrader: (23)

54inches

iTrader: (4)

I had a original 40 single in/ou on my 92 and everyone thought it sounded amazing. It did not sound like and other 3rd gen; of course it was a true L98 and had headers when very few 3rd gens had them, sooooo

Much better setup than a crossflow.....

RevGTO

iTrader: (12)

This is what I run on both my Formulas, except Hooker Maxflow instead of FM 44.

thatoneguybriz

iTrader: (2)

I actually had different mufflers on a flow bench at UTI when I was still in school and the worst flowing aftermarket muffler was a super turbo followed closely by a Flowmaster 40 series. The best brand we tested was a dynomax Ultraflo unsurprising due to its strait through design. I am not saying all flowmasters are bad but if all out power is the name of your game then I would recommend something else.