silverM6TA

iTrader: (5)

just like the title says, i have longtubes ORY and a flowmaster. is the flowmaster restricting my horsepower? if i was to get a diff exhaust how much would it help me?

conan

iTrader: (5)

The "chokemaster" is one of the most restrictive catbacks for the fbody. If you swaped to a hooker or a magnaflow you would probly see a 10-15 hp gain, and even a higher gain if you ever add a cam or heads/cam. One other option is to get a cutout. I had the flowmaster before my hooker and I liked the sound but just wanted more power, the cutout would make you the most power and keep the flowmaster sound for crusing.

ChevyRyda99LS1

10-15 HP gain dude you wont gain that much someone posted a thread where they had a flowmaster and and a cut-out they dynoyed cut-out open there was a difference of 8 hp from a cutout to the flowmaster, and he had dyno sheets to prove it search it and you will find it. Just switching catbacks is not going to give you 10-15 hp the cut out didnt even do that. People spread so much bogous info and never have proof 10-15 its just your personal choice. I like how the flows sound with my setup so I'm keeping them I'm not going to fork out more money for another cat-back for 8 hp if it bothers you that much like dude above said get a cut-out.

teke184

iTrader: (5)

yeah considering you can only expect 15hp from the free flowing catbacks on the market (the 3" ones)....i doubt you'd see that much from swapping the flowmaster out.

i can see 5-7hp though.

i would just do the cutout

4get gto

Where is Myth Busters when you need them?????

Catback is a Catback.....Busted..........

schuby87

iTrader: (6)

My car came with flowmasters and !cats when I bought it. I put in an electric cutout last year. This past fall I dynoed it on a dynapack dyno with the cutout open and closed, and saw a 20 rwhp increase.

k0261886

iTrader: (5)

I heard that a flowmaster is more restrictive than stock tho......... so I don't know maybe you can see a 10hp difference.

01ssreda4

iTrader: (96)

make sure we are doing apples to apples. a flowmaster crossflow aka 80 series is different from another series like say 40/50/60. two completely different mufflers.

Chubbz155

iTrader: (7)

I have heard exactly the same thing as schuby is saying here. My buddy had got a RWHP gain of around 20HP when he got rid of his flowjunk.

twitchtwice

iTrader: (12)

yeah but i bet he had other mods. if this is the guys only mod then he wont see that much of a gain most likely

Chubbz155

iTrader: (7)

That is true. I agree with you. MY buddy has a twin turbo car. The flowmaster is super restrictive I have on on my car right now because it came on the car when I bought it this past May. It is next on my list to replace. He will probaly see around a 5-10HP gain.

Fifedogg

iTrader: (15)

Get a Magnaflow. I think you will be very pleased with the sound and it has been proven to flow well.

CodeRed2000SS

flowmaster will restrict your car. these guys are right. but im not sure about gaining 20 RWHP or anything. sounds a little much to me.


magnaflow, magnaflow, magnaflow.... is the way to go

silverM6TA

iTrader: (5)

i really dont care for sound quality. if i did, i would have already bought something else. im just looking for power gains. i guess ill try the cut out advice and see how it works.

jsteele90

iTrader: (13)

my flowmaster chokes about 22hp and close to 30 tq. verified with the cutout open and closed when i got my car dyno tuned

teke184

iTrader: (5)

if you want performance....

TDs all the way

ChevyRyda99LS1

hey I got a question all I hear is my buddy this I dynoed this anyone got some dyno graphs to prove it, if not your point holds no weight. Like I said there is a post here where someone did the test and posted dyno sheets and from cut-out to flowmaster it was a 8hp lost all that other my sisters cousins baby's car did this on a dyno please spare us the bullshit. Matter of fact here is the post check it out.


https://ls1tech.com/forums/generatio...-e-cutout.html

schuby87

iTrader: (6)

Here is my sisters cousins baby's car's dyno graph like I was talking about. Lap 2= cutout closed. Lap 3= cutout open.

jp74

iTrader: (3)

I like my magnaflow, but I gained .2 tenths when I opened the cutout at the track on the same night. My car has a cam though.

ChevyRyda99LS1

and the only thing you changed in that was cut-out open I dont believe that you didnt advance any timing anything. I dont see a cut out giving you that much over any cat-back.