nalzaki

hey guys i was wonderin which series of flowmaster exhausts is louder n more aggressive? is it the 40 or 80 series?... i think the american thunder is the loudest of all flowmaster exhausts, right? n i think it is based on the 40 series!!! let me know wat u guys think...
thnks in advance....

BIG_MIKE2005

iTrader: (116)

Not sure on the loudness, but look elsewhere if you want a more high flowing exhaust.

I love the sound of my Hooker muffler. LS1sounds is a good site to listen to ALOT of different exhaust set-ups.

I personally wouldn't go with Flowmaster on these cars.

nalzaki

really? why not? is there a huge gap between flowmaster n other exhausts concerin hp lose?... i've seen rankin of top 10 or 20 best exhausts for ls1s n flowmaster had a good rankin, one of the top 10.. i remember it was better than borla...

LMz28

iTrader: (2)

im pretty sure the 40 series is the loudest/ most aggressive. there are two different 40s, ones supposed to have less enterior resonance. it is true though, although they sound fantastic, chokemasters are not that great for making power. whats the solution? get a cut out and enjoy the best of both worlds.

INMY01TA

iTrader: (1)

There is only one FM muffler catback for the F bod. The 80 series is the only crossflow one they have. It isn't loud at all. With the stock manifolds and cats on I could barely hear mine.

Iron Sights

Stay away from the 80-series; they flow like crap (search for a thread where someone picked up well over 15rwhp switching to a cutout). You're good to go on the 40s though.

Kiss My SS

the flowmasters suck ! but the 40 series is what you want but the slp loudmouth !

brink

i have a 80 series for driving around town.. sounds great but no performance increase.. i ordered my eletronic cutout today though!!

LMz28

iTrader: (2)

this might help, i grabbed it off ls1sounds.com these tests were done with a '90 mustang lx.

The results in HP order:
1.Flowtech Warlock (open) 374.2 hp/ 333.1 tq
2.Bassani Real Street 373.7 hp/ 333.8 tq
3.Hooker Maxflow 373.5 hp/ 333 tq
4.Borla XS 373.3 hp/ 332.6 tq
5.Magnaflow 372.8 / 332.5 tq
6.MAC 372.3 hp / 331.5 tq
7.Flowtech Afterburner 372.3 hp/ 330.1 tq
8.Hooker Aerochamber 372.1 hp/ 330.4 tq
9.Bassani 372 hp/ 333.5 tq
10.Spintech 371.6 hp/ 332.2 tq
11.Edelbrock Performer RPM 370.9 hp / 331.3 tq
12.Borla XR1 370 hp/ 334 tq
13.Flowtech Terminator 369.5 hp / 331.3 tq
14.Dynomax Ultra Flo 369.4 / 333.2 tq
15.Flowmaster 369.4 hp / 331.8 tq
16.Flowtech Warlock 366.3 hp / 325.3 tq
17.No muffs 365.2 hp / 330.1 tq

Sound Off in Quietest to Loudest (Decibels):
1.Borla XS, 80db at idle, 90db at 2,000 rpm, 110db at WOT.
2.Hooker Maxflow, 80db at idle, 90db at 2,000 rpm, 120db at WOT.
3.Magnaflow, 82db at idle, 91 at 2,000 rpm, 114db at WOT.
4.Flowmaster, 82db at idle, 93 at 2,000 rpm, 115db at WOT.
5.Flowtech Warlock, 83db at idle, 92 at 2,000 rpm, 112db at WOT.
6.Dynomax UltraFlo, 83db at idle, 94 at 2,000 rpm, 113db at WOT.
7.Borla XR1, 83db at idle, 96db at 2,000 rpm, 118db at WOT.
8.Bassani Street, 83db at idle, 96db at 2,000 rpm, 120db at WOT.
9.Edelbrock RPM, 84db at idle, 93db at 2,000 rpm, 118db at WOT.
10.Bassani Real Street, 84db at idle, 96db at 2,000 rpm, MAX. (120+db).
11.Flowtech Afterburner, 86db at idle, 94db at 2,000 rpm, 115db at WOT.
12.Flowtech Terminator, 86db at idle, 94db at 2,000 rpm, 119db at WOT.
13.Hooker Aerochamber, 87db at idle, 94db at 2,000 rpm, 114db at WOT.
14.SpinTech, 87db at idle, 97db at 2,000 rpm, 116db at WOT.
15.MAC, 87db at idle, 98db at 2,000 rpm, 119db at WOT.
16.No Muffler, 91db at idle, 103db at 2,000 rpm, MAX. (120+db).

Magnet

iTrader: (36)

^^^^good info

LS69TA

iTrader: (30)

The American Thunder is louder I believe. On Flowmasters, the lower the series, the louder they get. Stay away from the 80-series.

texasreb18

iTrader: (1)

i would stay away from the flowmasters...if you want loud get a LM1 or a cutout

Silver02TA

iTrader: (6)

i didnt think u could use a 40 series on 93+?

INMY01TA

iTrader: (1)

You can't in the stock location. Like I said in my post above^^ the only one that'll work is the 80 unless your making a custom true dual setup or some other custom setup.

LS69TA

iTrader: (30)

I ran a single 40-series 2-chamber on my '98 T/A. Just ran dual tailpipes off of it.

nalzaki

thanx guys for the info...

BriancWS6

iTrader: (18)

Forget the catback and go true-duals/x-pipe/single chamber flows

This is a botched run, but you can hear the exhaust pretty good
http://video.ls1tech.com/video/403c9...4b008bd3b2.htm

67SS&99SS

iTrader: (7)

Although, at one time, I had the 80 series flowmaster american thunder catback on my car along with the SLP y-pipe and it wasn't much louder than it was when it was stock. I noticed no difference in power at all. However i put this same catback on my uncle's LT1 Z28 (!cats) and it is loud! Almost as loud as my true dual setup suprisingly.

ChocoTaco369

weird. flowmaster is one of the louder catbacks. you may have had a clogged cat or something the 80 series was pretty darn loud on my old V6 firebird.