Called the online number today and punched in the 4500 ext. code. Jason answered. I explained the 3/10 loss on a G-tech and he said he was not at all surprised. I asked if they had any dyno runs on this muffler and the Lightning. He said No. All they have tested is the single in and out systems. Am I wrong or aren't they selling these mufflers as a performance piece/enhancement. I guess I could be wrong. I have before. Seems just a modicum of tone is all anyone is suposed to expect from a Magnaflow product for the L. After spending $175.00 on this lump,installed, I should be horse whipped for not opting for the ole muffler delete option right off. I surmise if you lose a muffler to rust or rot maybe a Magnaflow wouldn't be so bad. I don't mean to be nasty but seems they already know it ain't gonna help. Sal may have said it best. The factory muffler sounds wimpy but it better than aftermarket when it comes to performance. By theyway I also lost 1/2 # of boost with this 12468 Magnaflow.

 

Muffler replacements add nothing. I think that horse has been beat to death, but .3 seconds loss in the quarter is a bit much for me to believe. Oh well, at least I'll have the satisfaction of listening to my great sounding magnaflow as some "wimpy" sounding Lightning leaves me in the dust.


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1999 Black Roush-lowered Lightning, Swanson Chip, intake & exhaust mods, 3.73 gears.

13.019@105.19mph

http://www.svtlightnings.com/go_rila/



[This message has been edited by sixpipes (edited 03-14-2001).]

 

I'll have to get a windshield banner,
"Silent But Deadly"

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slow ol 99 lightning, no mods/leaks/dealer visits,yet

 

Check you intercooler or something. Mine ran a tick quicker at the track and I lost no boost. I running the 12568 but it's hard to believe it would be that kind of difference between these two mufflers. Gforce measured about an 8 HP gain on his g-tech with the 12568. Maybe they put a bottle neck in one of your bends or something. You seem to be the only one having this problem.

------------------
Later,
Chuck
Black 00
Chuck's Lightning Page

 

Like I posted last night, the exhaust is a part of the entire package. While you may be correct in that all Magnaflow customers might of lost HP at some place in the power band.

I still feel that the 12568 is only a part of the entire package, and everyone could have a different mod package.

We can debate this till the end of time, but until we each know a standard base line (temp, alt, hum, BP) and what mods we all have, then compare to each other how can we say what really works and what doesn't. Can you imagine me stating that Sals Chip only makes 10 HP only to find out later that I’m still running a stock air box @ 115 degrees?

All I can say is that I feel my L is very sensitive to air temperatures. I got my L back when the air was hotter than when I delivered the truck and it drives like the air temperature is 30 degrees colder than normal. Abet this is only really noticeable in the mid range.

Go figure.

 

Yep, I sure did, and my backside felt it too, although just slightly. But, it's just a muffler. I had DynoMax Bullet race mufflers on before this. These are straight through and it was LOUD when they burned in after a few days. I couldn't stand driving the L more than about 10 miles because my ears would ring from the interior resonance.

I think the L as it sits from the factory is a very nice piece of work, including the exhaust system. All of us are doing different things to get reduced ET's. I believe installed mods greatly affect how new, different mods perform, along with your altitude and temperature, and on, and on and on.

Chuck and I have basically the same mods. And we're blessed with good gasoline. And our altitude is probably within a hundred feet. We both run the 12568 and it performs well. I am most impressed with the bottom and mid range torque the muffler has provided with my mods. High end hp is negligible, but there nontheless. I went for sound and I got it. And it didn't hurt me in the performance dept.

I drive my truck everyday except for when the roads are wet. This muffler on my truck is about like the FRPP T/B - no big hp gains, but increased fun factor. That's what I wanted, and that's what I got, because it sounds a hell of alot better than the stock muffler and is slightly stronger. Maybe it's the 12468 that causes problems because of its small size, as the 12568 is nearly identical to stock in it's dimensions. I dunno.

------------------
Jim
Black '00
#1,757 built 3/30/00
Clear corners
JDM street program
JDM 2# blower pulley (ordered)
J.L. Stage II ram-air
FRPP Oval throttle body (ordered)
90mm MAF
MagnaFlow Exhaust

 

gforce
Im interested in getting the loudest sounding exhaust i can get for my truck how much did the magnaflow 12568 that u are running cost do u have any pics of it installed and did u leave stock headers on the truck thanks for any help u can provide im looking for people not only to stare a my truck but for them to hear me to
thanks

 

So the 12568 is almost a drop in replacement for the stock Lightning muffler? Might I ask why you didn't go with the stainless version? That is the one I'd go with on my HD. I understand the HD is supposed to have the same exhaust as the Lightning which is apparently a dual in / dual out. I haven't actually seen one yet.

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- Soon to be 2001 F150 Harley Davidson Special
- 1993 Mazda Miata, wifes car
- 1994 Harley Davidson Heritage
- 1976 Honda CB750K, Original
- 1965 Honda 305 Dream, Original
- 1971 Triumph Trophy 650, Original
- 1971 Norton Commando
- 1970 Honda Trail 90, Original
- Yamaha 500 Short Tracker, racing #69
- 1984 Yamaha Virago 1000, wifes bike
- 1981 Honda Passport 70, wifes bike