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Discussion Starter #1 (Edited)
(re-posting from my build thread)

I had been looking for side pipe mufflers for some time. The noise level has always been an issue for me. I wasnt willing to spend the $$ on mufflers and then have the packing blow out and have to go through the process of cutting out the glass pack and starting over again. The plan was to go with a rebuildable muffler. The only one I was aware of, was made by Burns Stainless, but the pair of mufflers ranges from $900-1200. I had a friend with them and they worked incredibly well... and rebuilding was easy enough from what I found. The price was keeping me from making the jump. I had even considered making mine rebuildable.

I was literally a day away from spending $1200 on rebuild-able Burns Stainless mufflers when I found the new Flowmaster 13530320 Slimeline. We heard about them at SEMA a few years ago, but no one at the booth knew anything about them. Searching their web site netted nothing as well. Before making that last call to Burns, I decided to do one more search and found a few discussions online, including here along with a part number. Tennessee Tim installed them and it appeared he was pretty happy. With that, I was ready to take a chance on them.

https://www.youtube.com/watch?v=Xuww8Yjyzsk

https://www.youtube.com/watch?v=HlDiQkWNhIY

They are SS, have no packing to burn out and have a lifetime warranty and at $209 each they are fairly priced. From what I gathered they are very effective at taking the sharp tone out of the exhaust which is what we need. I had to wear ear plugs with the FFR pipes, and even then my ears rang after driving the car.

They have an added benefit of having a special insulation that really cuts down on the heat of the outer shell. Anyone that has had a "cobra bite" and the resulting lifetime scar understand the importance of this.

So on with the install:

Made up a support to get the new mufflers in the exact spot desired.



After welding them up. It was a bit tough as the fit-up wasnt as tight as one would prefer.







Ive had the oppty to put maybe 300 miles on the car since installing the new mufflers and Im really happy with the change. As mentioned before, earplugs were a must, and even then my ears were sore. After the new mufflers, I havent worn them and my ears dont hurt :D The sound is just perfect to me. Still sounds like a cobra but without the sharpness.

Against my better judgement, after coming back from a spirited drive I decided to try to quickly touch a pipe where your leg would contact it. First quick tap... wow, no skin left on the pipe... tried a bit longer, then longer still... and no burn. Yes its still hot and I dont know if I could leave my hand on it for more than a second, but its cool enough for your brain to register and tell your leg to move it before getting a 2nd degree burn. This alone is worth the price of entry.

The only drawback to these pipes is they are fairly heavy. If you are really concerned with weight, then the Burns are probably a better bet.

Overall, I couldn't be happier and I have several friends that are buying them as well once they heard them on my car.

Appearance wise, I think they look much much better than the normal sized glass pack. I was a bit worried that they would be to big looking, but after installing them, I like the looks better.

David
 

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Great post.

I have an extra set of sidepipes that I plan on trying a muffler swap in...but mine aren't stainless. I wish flowmaster made a non-stainless version.

I might have to look for a used set of beat up stainless side-pipes over the next few months.
 

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Great post.

I have an extra set of sidepipes that I plan on trying a muffler swap in...but mine aren't stainless. I wish flowmaster made a non-stainless version.

I might have to look for a used set of beat up stainless side-pipes over the next few months.
If you cannot get a set of older, used SS pipes, you can weld stainless to carbon steel. If you use tig, use a 309 filler wire and leave the arc on the carbon side to add filler then weave the puddle over onto the stainless. Make sure when welding stainless to use Solarflux Type B on the inside or purge with argon to prevent sugaring the inside of your welds. Use multiple, opposing beads (at least 6 for that diameter) and let the pipe cool to <300F in between pairs of beads. Just have them ceramic coated afterwards and you'll never tell they're different metals.

I have to thank Dave for this thread also. I have a set of used stainless pipes I was going to do an auger install on, but this looks easier. I wont be able to use my DRUMMERMIKE heatshields but it sound like they won't be necessary.
 

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Any chance you could record the sound? Looks great on the car.
 

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They look pretty sweet! I wonder what the sound difference is between the 24" and the 30" pipes! With my 302, the 24" may be all I need!
 

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I wont be able to use my DRUMMERMIKE heatshields but it sound like they won't be necessary.
I have these Flowmaster Slimline mufflers (still in the boxes) and the Drummermike heat shields. Tonight I put the Drummermike heat shields on the Flowmaster mufflers and they fit fine. I had purchased some 5" t-bolt clamps to put these heat shields on the Flowmaster mufflers.
 

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If you cannot get a set of older, used SS pipes, you can weld stainless to carbon steel. If you use tig, use a 309 filler wire and leave the arc on the carbon side to add filler then weave the puddle over onto the stainless.
I have a 220v Mig setup (wire feed / gas). Can that be used to weld them?

I guess as another option, I could just get everything setup with a few tack welds and then bring it someplace to get finished properly. I would either ceramic coat them or just spray-paint them white with a high-temp paint.
 

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They look good! Like the idea of a bit less noise as I am already deaf in one ear and not from driving a roadster!
 

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I have a 220v Mig setup (wire feed / gas). Can that be used to weld them?

I guess as another option, I could just get everything setup with a few tack welds and then bring it someplace to get finished properly. I would either ceramic coat them or just spray-paint them white with a high-temp paint.
Yes, you can get 309 MIG filler wire. Read this. You should use a Tri-mix gas (90% helium, 7.5% argon, and 2.5% carbon dioxide). I would use solid wire as the metal isn't thick enough to need flux-core to increase penetration. As with any welding, get some scrap pieces of sheetmetal and practice. When you think you have made a good weld, look at it closely under magnification, then put it in a vise with the weld bead perpendicular to the jaws and bend it over to see if it cracks or breaks. We do this formally, called "qualifying a weld procedure".

The other option is that I am moving to Greenville/Anderson area in the next 2-3 months. I wouldn't mind loaning you my TIG rig for a while.
 

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Discussion Starter #15

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David,

I see in one of your pictures the sidepipe support bracket and hardware on your lift, below the sidepipe. Did you reinstall this and if so, did you make a new mounting bracket to weld on the muffler section or transfer the old one? Did you use a reinforcing pad around the mounting bracket on the muffler wall?

 

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I just ordered a pair from Summit for $142 each. Should see them next week. My ears wil be thanking me...not to mention my neighbors!
 

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Just ordered a set myself.:yes:

Thanks David for posting.:thumbup:

George
 

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I just wonder how well they flow?? The FM "Chambered" mufflers do NOT flow well compared to other performance mufflers. These I've never seen any flow specs on.
 

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Discussion Starter #20
David,

I see in one of your pictures the sidepipe support bracket and hardware on your lift, below the sidepipe. Did you reinstall this and if so, did you make a new mounting bracket to weld on the muffler section or transfer the old one? Did you use a reinforcing pad around the mounting bracket on the muffler wall?
I cut out and re-used the existing bracket from the FFR mufflers. I needed to relocate the holes in the 2" tube, but its installed as it was originally with the exception of only using one bold at the muffler.

David
 
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