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Re: Dynomax mufflers VS Flowmasters
[Re: Sunroofcuda]
#1126516
12/04/11 03:31 AM
12/04/11 03:31 AM
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Joined: Jan 2003
Posts: 21,519
N.E. OHIO, USA
A12
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 21,519
N.E. OHIO, USA
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Quote:
Quote:
Funny how the little "single" chamber Flowmaster wasn't on that list, just the two and three chambers. 
Here's what the single chamber FM looks like on the inside - looks like the exhaust instantly hits a wall upon arrival into the muffler. This causes a huge backlash, which is NOT good. I'd rather run a longer one! We tested 2 & 3 chamber, & Delta Flow FM's when I worked at Dynomax. The 2.5" AND 3" of these series FM's had flow rates of right around 350 sCFM. This translates into 318 loss-free HP with a dual exhaust setup. The Super Turbo 17748 (2.5" x 20" Hemi Super Turbo) has a flow rate of 415 sCFM, which = 378 loss-free HP dual exhaust. A straight-through stainless 2.5" Ultra Flow (#17289 offset/center) has a flow rate of 955 sCFM, which allows 868 loss-free HP on dual exhaust. This is the best flowing 2.5" x 20" oval, offset/center muffler on the market, bar none. The deflector setups inside the Flowmaster mufflers are horrible for flow - they totally kill the flow velocity of the exhaust. Buy them for sound, but not performance.
BTW, a Dynomax 3" x 20" offset/center oval Super Turbo #17769 flows 551 sCFM, which provides 500 loss-free HP on a dual exhaust. A 3" Welded Ultra Flow (20" body, offset/center) #17233 flows 1800 sCFM thus providing 1636 loss-free HP. You can decide from here!
No wonder the GTX feels like the exhaust has a cork in it compared to the stainless Ultra-Flows.....that's it the Slowmasters are coming off in the Spring...  
MikeR
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