Flowmasters

[jrc_03_gt]

Flowmasters. Loose torque??

Is it possible to add flowmasters and loose torque? Maybe its just me but after I had the stock mufflers replaced with flowmasters american thunder 40 series, it seems to accelerate different. Its almost as if it lost some quickness. I also have a k&n air filter installed.

 

[RacerGT]

I got some welded in about a year ago and didn't notice any power loss... just not possible over the stock system.

 

[00BlackBeautyGT]

I just got some 40 Series welded in a couple of days ago and noticed that the car runs and sounds so much better over stock. No power loss for me. Check your exhaust. It might be leaking somewhere.

 

[01'TRUE BLUE GT]

You might laugh at this one, but I've heard it's happened before. Are you sure they didn't install them backwards?? That would create excessive backpressure and cause a loss of power for sure. The sad part is they're even labeled and some people are still dumb enough to put them on backwards ... they were only meant to flow in one direction only. Even without the dummy "inlet" and "outlet" stamps on the case you can clearly see how they have to go on by looking inside them. Flows aren't THE best flowing muffler out there, but they are better than stock ... especially soundwise.

 

[00BlackBeautyGT]

Flows (Matched with a good mid-pipe) - Deep American Muscle Roar!!!

 

[03GTnewbie]

Flows (Matched with a good mid-pipe) - Deep American Muscle Roar!!!

I agree. I got mine in 3 weeks ago and couldn't be happier.

 

[KJ Hoppus]

when i got mine weilded in i felt a total difference. i felt like i gained alot of torque down low and a little more hp up high. but i also had a few mods already done. o/r xpipe, Steeda pullies, t/a, cai, coils, wires. Flows

 

[Trublu01]

I went from the dealer to Meineke and had them welded, now they are matched up with MAC LT and O/R X and very loud. IF there was any loss in power, the sound makes up for it.

 

[jrc_03_gt]

I went from the dealer to Meineke and had them welded, now they are matched up with MAC LT and O/R X and very loud. IF there was any loss in power, the sound makes up for it.

I did the same dealer to muffler shop. I just wanted to know if this is a common result after changing mufflers. Maybe I will disconnect the bettery to reset the computer. How long should I disconnect it for to reset it?

 

[cantthinkofname]

Flows =

there was a guy on here that had a 96-98 (i forget) and had flows welded in... went to a dyno and lost 5-7 hp :-\ or so

 

[Trublu01]

There is no need to reset the computer as for the dyno, it's hit or miss, may lose on 1 car but stay the same on another.

 

[jrc_03_gt]

There is no need to reset the computer as for the dyno, it's hit or miss, may lose on 1 car but stay the same on another.

do you think I would get it back if I were to switch back to stock mufflers?

 

[Trublu01]

I think it may just be you! However anything is possible. The sound is worth the little bit of loss you MAY have encountered, well to me anyway.

 

[RacerGT]

Flows =

there was a guy on here that had a 96-98 (i forget) and had flows welded in... went to a dyno and lost 5-7 hp :-\ or so

Do you have any proof to back your claim? Because if you don't, your post is worthless.

 

[jrc_03_gt]

Do you have any proof to back your claim? Because if you don't, your post is worthless.

this is my 2nd mustang gt. My 1st one was a 98 gt and I bought it new also. I love driving my mustangs, beleive me ther is a noticeable difference. It seems as if it does not run as hard going through the gears now. But I also noticed I can run each gear for a longer period now. The shifts can go longer now.

 

[RacerGT]

this is my 2nd mustang gt. My 1st one was a 98 gt and I bought it new also. I love driving my mustangs, beleive me ther is a noticeable difference. It seems as if it does not run as hard going through the gears now. But I also noticed I can run each gear for a longer period now. The shifts can go longer now.

Well, I was talking to cantthinkofexcuses up there...

But, there should be no power loss. The stock exhaust is very restrictive. Just give it time for the mufflers to break in properly.

 

[jrc_03_gt]

Well, I was talking to cantthinkofexcuses up there...

But, there should be no power loss. The stock exhaust is very restrictive. Just give it time for the mufflers to break in properly.

This 03 only has 900 miles on it.

 

[jrc_03_gt]

I might reset the computer. In my owners manual it tells you how to reset or re-Teach the computer by disconnecting the battery and having the car idle untill it warms up all the way then turn on air condidtioner for 1 min at idle then it says to drive for 10 miles.

 

[1fast03pony]

This 03 only has 900 miles on it.

actually, just wait for the motor itself to break in. mine felt faster (significantly) after 2500 miles.

 

[bierbelly]

Flows =

there was a guy on here that had a 96-98 (i forget) and had flows welded in... went to a dyno and lost 5-7 hp :-\ or so

That would have been me. After the headswap on my '98 I dynoed 248/292, after welding in flows, 241/280 (I think that was the tq value, don't remember for sure). But definitely felt it driving away from the muffler shop.