Magnaflow Magnapacks or Borla Stingers. I personally like the Stingers just a bit better.
Magnaflow Magnapacks Catback with Mac O/R H pipe - YouTube
2003 Mustang Gt Borla Stinger Bassani O/R X - YouTube
Not too loud at part throttle, but it gets REALLY loud when you get on it. What midpipe and headers will you be running?
Also, about the loss in low end torque. It is of my personal opinion that that is complete BS. I've heard it SO much on so many different forums, and I've never once seen any proof to back it up. My personal experience is a .2 second and nearly 2 mph gain in the 1/4 mile with an offroad midpipe and catback. And just because I'm bored right now, I'll go into a more in-depth explanation.
Back pressure, which is simply the force against the air flow created by catalytic converters, restrictive mufflers, bad bends in the pipe, etc., is ALWAYS a bad thing. Yes, your car requires a certain amount to do some complicated stuff inside the heads, but that amount is easily provided by the friction losses and aerodynamic drag created from simply moving the air from the front of the car to the rear via the exhaust pipes. The cats create quite a bit of back pressure, and removing the cats (and/or restrictive muffler) will decrease that pressure and create more power.
The problem most people have is separating back pressure from exhaust velocity. Faster moving air helps pull the exhaust gases out of the combustion chamber better (read: scavenging), which is the reason why long tube headers work. Your factory exhaust has a 2.25 inch diameter, from the exhaust manifolds back. If you replace that with a 3 inch exhaust, the speed of the air moving through those pipes is going to decrease (as per some relatively simply fluid dynamics principles), although not by a whole lot because the 2.25 inch piping itself isn't really restricting much in the first place. So, slower moving exhaust = less torque.
When you go and put an offroad midpipe and/or catback on your Mustang, you are both removing back pressure (by removing the cats, better flowing pipe bends, etc.) and decreasing the exhaust velocity (by increasing the diameter of the pipe). However, the amount of power/torque you gain by removing the back pressure is MUCH greater than the amount of torque you lose from the decreased exhaust velocities.
Make sense?
so i got my slp lm1's on today. let me tell you they sound a whole lot better than flowmaster 40's. they have a louder idle and sound a lot cleaner and smoother. i didnt feel any loss in power. when i get on the highway all i hear is drone with the flows and it was horrible with the slp's they have no drone at all they are quiet when cruising but when you get on the pedal they scream they are awesome. they have deep tone to them also not just loud. they are a good muffler if you have emissions strict state or you wanna get the cats on. they are a pain to install but they are worth it to me they sound so much better than the flows
Whereabouts in Oregon? If you want and are in the pdx area, pm me and I'll have you come to one of our mustang meets. You can hear the combo of bassani x(w/cats) and Borla CB (stinger).
It's loud as hell, and the best combo I think I've ever heard.
I live in Portland, so I might take you up on that. Is anyone using loudmouths, I'd also like to hear those in person.
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I have posted vids of mine before. Just search my name and you will find them. If not I will post some when I get off work tonight.I live in Portland, so I might take you up on that. Is anyone using loudmouths, I'd also like to hear those in person.
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Magnaflow Magnapacks or Borla Stingers. I personally like the Stingers just a bit better.
Magnaflow Magnapacks Catback with Mac O/R H pipe - YouTube
2003 Mustang Gt Borla Stinger Bassani O/R X - YouTube
Not too loud at part throttle, but it gets REALLY loud when you get on it. What midpipe and headers will you be running?
Also, about the loss in low end torque. It is of my personal opinion that that is complete BS. I've heard it SO much on so many different forums, and I've never once seen any proof to back it up. My personal experience is a .2 second and nearly 2 mph gain in the 1/4 mile with an offroad midpipe and catback. And just because I'm bored right now, I'll go into a more in-depth explanation.
Back pressure, which is simply the force against the air flow created by catalytic converters, restrictive mufflers, bad bends in the pipe, etc., is ALWAYS a bad thing. Yes, your car requires a certain amount to do some complicated stuff inside the heads, but that amount is easily provided by the friction losses and aerodynamic drag created from simply moving the air from the front of the car to the rear via the exhaust pipes. The cats create quite a bit of back pressure, and removing the cats (and/or restrictive muffler) will decrease that pressure and create more power.
The problem most people have is separating back pressure from exhaust velocity. Faster moving air helps pull the exhaust gases out of the combustion chamber better (read: scavenging), which is the reason why long tube headers work. Your factory exhaust has a 2.25 inch diameter, from the exhaust manifolds back. If you replace that with a 3 inch exhaust, the speed of the air moving through those pipes is going to decrease (as per some relatively simply fluid dynamics principles), although not by a whole lot because the 2.25 inch piping itself isn't really restricting much in the first place. So, slower moving exhaust = less torque.
When you go and put an offroad midpipe and/or catback on your Mustang, you are both removing back pressure (by removing the cats, better flowing pipe bends, etc.) and decreasing the exhaust velocity (by increasing the diameter of the pipe). However, the amount of power/torque you gain by removing the back pressure is MUCH greater than the amount of torque you lose from the decreased exhaust velocities.
Make sense?
I had lm1s on my 97 with pi engine swap with a bassani o/r-x pipe and absolutely loved it. Sorry I don't have a clip, but I think you'd be happy with em
I had no performance loss.
Here is my 2002 GT with BBK Lts, and catted H and LM1. I love it, but I think any SLP product with an X pipe sounds horrid.
2002 Mustang GT BBK LTs, catted H, and SLP LM1's - YouTube
The pipe numbers are for the outside diameter, but since I do not know the wall thickness I will use 2.25" and 3"
► (2.25/2)^2*pi = 3.976078202199582 sq inches csa
► (3.00/2)^2*pi = 7.068583470577035 sq inches csa
► 7.068583470577035/3.976078202199582 = 1.777777777777778 increase in csa
FPS = ( CFM / CSA ) * 2.4
Stan
You're right. I shouldn't have used 3 inches in my example, as almost no one uses a 3 inch pipe, and the people who do are either ignorant or are making enough power that the loss in velocity is insignificant.
99% of street 'Stangs out there use 2.5 inch mid pipes, which the area is 4.9087 square inches. A 1.23456789 increase in cross sectional area. (As a side note, that's crazy that (1.125^2)/(1.25^2) is 1.234567890....)
While I don't have any scientific evidence or anything, I still hold that that amount of decrease in exhaust velocity is vastly overshadowed by the reduced backpressure from the cats. And don't forget that the restriction caused by the cats also reduces the velocity.
LM1's with an O/R midpipe?
That's what I'm rocking right now. Yes I want a catted mid but at 450 bucks for a long tube catted mid pipe I would rather spend that money elsewhere.
For those saying that mufflers do not offer any sort of performance gain over any other. Here is a thread to prove you wrong. A guy over on Corral with a supercharged car swapped over to 3" exhaust from 2.5" to do a comparison on power. He had some full body Magnaflow mufflers laying around, along with some Mac flowpath's. So he decided to do a comparison of the 2 mufflers in 3" form. The Mac flowpaths made 40+rwhp over the magnaflows at 5200rpm. Here is the thread:
MAC Flowpath vs Magnaflow Dyno results - Ford Mustang Forums : Corral.net Mustang Forum
He picked up that 40rwhp+ because he went from a 2 1/2" exhaust, to a 3" exhaust....not because of the type of muffler he was running.
If you would have read the thread, you would know that's not true, here's a little break down for you.
He had a 2.5" prochamber, with a 2.5" Mac flowpath cat back and then swapped to a 3" prochamber with a 3" Mac flowmath catback and gained 45rwhp.
He then had a set of 3" Magnaflow mufflers laying around that he swapped in and lost 45rwhp.
He said when he swapped from the 2.5" to 3", he had to add in a lot more fuel because it was moving a lot more air. When he put the Magnaflow's on, the car was bad rich because it was not moving as much air, so they had to retune it for the Magnaflows. He has dyno graphs in the thread and you can clearly see that it loses power all through out the power band, as well as torque.
FYI: The car was tuned for the Mac flowpaths, then tuned for the Magnaflows. He said they spent a good while tuning it with the magnaflows on and that it was simply down in power.
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