Masochist

iTrader: (1)

Does anyone have any hard evidence that the standard Flowmaster 40 series catback for LS1 F-bodies really is as bad as people say? I say this because... my car has it and I'm not sure what I want to do with it.


If it really is THAT terrible, I'm going to see about changing out the muffler and keeping the pipes hung, unless a whole new catback would be in order? Thoughts on this would also be nice. Also, Flowmaster + A cut-out perhaps? Would the sudden massive difference(assuming Flowmaster does suck) in flow perhaps throw the tune off if I just flipped open the cut out?


Any help at all is appreciated!!

youguessit

Yes, flipping open the cutout would make you run lean and put your timing off a lil. Unless your car is tuned for the cutout open you probably wont get any power from it. The flowmaster does hold the car back once you have headers and start to get above 5500 rpms.... something a lil freer flowing like a magnaflow muffler would help.

mikenews

iTrader: (9)

They have been proven to lose power on dyno!

TheSilverOne

iTrader: (22)

the flowmaster catback for our cars is an 80 series muffler and they suck

93redBIRDman

iTrader: (9)

bad flowing exhaust = bad
flowmasters are CHAMBERED!! = bad flow

ae13291

iTrader: (8)

so if i get a cutout will i pick up more power???

MeentSS02

iTrader: (11)

A cutout will essentially bypass the muffler (although some exhaust will still flow through as I've found out through my own experimentation), so yes, any losses associated with the Flowmaster muffler will be negated.

The Flowmaster is my favorite sounding exhaust on stock exhaust manifolds and cats...it is too bad it doesn't perform like it sounds.

TXZ28LS1

iTrader: (5)

i was amazed that flowmasters are horrible!! they have been around the game a very long time so i figured they would be good for our cars.

MeentSS02

iTrader: (11)

That is the biggest misconception out there for these cars...if I had a nickle for every time someone asked me if I had a Flowmaster exhaust, I'd be rich...instead, I just have a nice look of disgust when someone asks me that, and I get the question constantly.

LTLRDSS

iTrader: (2)

i have flowmasters but i have their single chambers and td's

sl99ls1

Just Get A Borla Cat Back They Sound Good

JohnnyC

You do not have to tune for a cutout - they make power right out of the box. The flowmaster does sound good, but there are so many other exhaust setups that sound good and flow. Why not go with some of the proven winners like magnaflow, hooker, SLP, Corsa, GMMG, duals, ect?

jimbo98z

iTrader: (3)

I picked up 17 lb-ft and 15hp down low and about 12 hp/tq at peak with cutout open vs. closed with flowmaster.

Another bad thing about the Flowstopper is that they almost always rust out from the inside and you will start to get resonance. The only good points about the Flowmaster are that it's cheap and easily available.

I'll be yanking mine out and putting duals on, hopefully while I'm home over Christmas.

12secSS

iTrader: (30)

Flowmaster, they have the BEST marketing department of all the exhaust companies. To bad though, as they could use a good engineering department.

streetassasin

iTrader: (30)

x2 I love my Borla

svodave

LOL!

radz282003

iTrader: (1)

+2

I have one and with QTEC I wouldn't change anything except go with a larger I-pipe in the future. With the QTEC closed, it sounds mellow at idle and has a nice sound up top and WOT; with it open, it screams.

black01_WS6

iTrader: (13)

Hooker's are chambered and they flow very well on a f-body.

DarkJuggalo

iTrader: (6)

i love the sound of flows, but very disappointed in the results =(

ncd1966

iTrader: (2)

i had a flowmaster with cats and stock manifolds sounded good. but then I went to Long tube headers and off road y pipe and its sounded like crap. I have a hooker cat back and I gained about 15 rwhp over the flowmaster. I dynoed before and after.

before flowmaster 312 rwhp/ 317 rwtq

after hooker cat back 327 rwhp / 321 rwtq