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Old 10-26-2006, 09:14 PM
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Homemade Flowmasters??

My friend Kennyand I thought of this crazy idea, since we are dirt poor hotrodder teens, to make our own Flowmaster mufflers out of old junk mufflers.

We thought we could cut one side of the shell off, gut out all the old baffles, and then make new baffles out of heavy gauge sheet that would mimic the design of Flowmaster 40's perfectly. I figured we could get the exact measurements from the demo model at Fleet Farm that is a cuttaway to acheive the right dimensions. Mig weld them in, then slowly weld the cover back onto the shell. Anybody else think about or attempt this? I think its VERY possible, just have to get some mufflers that are almost exact to the shell dimensions of the Flows.

Tell me what you think...

I guess now once I mention it, Flowmaster is going to pull out all there cuttaway photos from Jegs and other catalogs!!

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Old 10-26-2006, 09:33 PM
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I heard of a guy who made some stainless ones for his own car, and was thinking about making some aluminum ones for racing.
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Old 10-26-2006, 09:33 PM
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I know a guy who did just this. He uses 3in exhaust pipes that he cuts in half to make the sides and then just uses steel to make the top and bottom and the baffels. I've heard em before and they did sound good but they weren't made of aluminized steel so I shyed away as they would last long.
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Old 10-26-2006, 09:45 PM
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A friend of mine is making a set for his truck in his high school shop class. No clue how they will turn out, but I had never heard of anyone making their own mufflers before. Rusting out would be quick (IMHO) with mild steel.
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Old 10-26-2006, 10:42 PM
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Get them ceramic/metallic coated inside and out and they will last forever. actually you could also powder coat them and they will also last forever. You can powder coat the entire exhaust system except for headers which get too hot. Everything past the header flange can be 'coated.
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Old 10-26-2006, 11:28 PM
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Hey JerryMopar,

I love the idea! I can't see any reason why it would"nt work. I do think it will rust out pretty quick if you use mild steel but you could make up for it by using thicker metal for the deflectors. Or even cheaper you could use the old parts or other old mufflers for the deflectors.

At any rate I would love to hear how it goes and what they sound like.

Jordon
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Old 10-27-2006, 12:33 AM
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Quote:
Originally Posted by jimfulco
I heard of a guy who made some stainless ones for his own car, and was thinking about making some aluminum ones for racing.
Is there anyone that makes full aluminum only exhaust????? that would be somethin...
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Old 10-27-2006, 05:43 AM
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It might sound ok on a V8....

I tried that with my daily driver that is Turbo charged. (89 Maxima)

I cut the stock Nissan muffler apart.. made my own baffles and tubes in/out.

Looked great.. but what a loud muffler! OMG... this thing sounded terrible. I tore it apart 3 more times trying to get it to be quiet.. no luck...

I orderd a Dyno Max Super Turbo and the car sounds back to stock! I was SO happy... These mufflers are cheap and flow better than FlowBasterds.

Mine was a TOTAL failure... but what the hell.. give it a try! I Had fun trying and learned that a 40.00 muffler was worth every penny.

BTW... my 222,000mile Maxima 3.0L with a GN TA49 Turbo runs13.40 @ 108mph on pump gas through the muffler with 12lbs of boost.

Good luck... do a write up if you find somthing that works!!!
~Scott
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Old 10-27-2006, 06:42 AM
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Im glad to hear that everyone likes the idea. One of these days I will go around to the local exhaust shops and check out their junk pile to find the right canidate to experiment with.


The 3 inch exhaust pipe, custom fab idea sounds good!

I figured I could paint oil-based paint on the case to keep it from rusting. It works really well, It bakes itself on after a few runs, and dosn't scrape off. I have had that on my trucks exhaust that I made for it, and it hasnt started rusting where I put the paint on.

I picked up some baldies to the other day from Merlin, they make very good poorman's slicks.
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Old 10-30-2006, 10:55 AM
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I used a big soupcan as the case and a little soup can perforated for some baffles, aimed to help flow over the stock crappy briggs n stratton muffler and used some steel wool to help quiet it a little... it was a smidgen quieter, sounded a little deeper and throatier, but when I revved the little 8hp mill it blew out the steel wool glowing red and after a couple minutes the bolted together muffler came apart.

Gotta love hotrodding lawnmower tractors.
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Old 11-01-2006, 03:45 PM
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I thought about doing something similar once but have the bottom panel removable so I could experiment with different baffle techniques. It would be a functioning lab.
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Old 11-01-2006, 07:09 PM
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Here are some auger mufflers that just slip in a pipe. We use these on T Buckets alot and they work good.

http://www.speedwaymotors.com/xq/asp...qx/Product.htm
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Old 11-03-2006, 06:48 PM
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Quote:
Originally Posted by RPM
Here are some auger mufflers that just slip in a pipe. We use these on T Buckets alot and they work good.

http://www.speedwaymotors.com/xq/asp...qx/Product.htm
Those are street legal? How loud are they?
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Old 11-03-2006, 06:50 PM
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Quote:
Originally Posted by Brian_B
A friend of mine is making a set for his truck in his high school shop class. No clue how they will turn out, but I had never heard of anyone making their own mufflers before. Rusting out would be quick (IMHO) with mild steel.

Thats a pic of one before the topplates went on. They sound great!!! I'll try to get a soundclip soon.

BTW i'm his friend lol.
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Old 11-07-2006, 03:09 AM
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That, ^, looks like it would be one HEAVY muffler. How heavy is it so far?
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