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#1 |
Registered User
![]() Join Date: Nov 2000
Location: chimayo, nm, usa
Posts: 898
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Tell me about Magnaflows Please
I was planning on installing some flowmasters on my truck, but there are sizing issues because of their width, and magnaflow offers different sizes on their ovals, and they are cheaper. Also I keep hearing they are a straight through design, and offer better performance. I mean I want the sound of the flows, but performance is my priority. Seeing how flows are made, it doesn't seem like they are the most efficient way of exiting the gases. I mean, I'm no scientist but getting from point A to point B is quicker in a straight line than through a maze, right??!!
What experience/advice do you all have??? Thanks |
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#2 |
Registered User
Join Date: Feb 2003
Location: Wichita Kansas
Posts: 223
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magnaflows
Hello 72step,
I have a set of magnaflows on my 1990 gmc and as for performance and sound they are great. But as for duability and long life I would give an F++++, I had the exhaust installed 17 months ago and the muffler has completely rust out at the rear, and unless you pay the extra for the lifetime warranty on the muffler(had no idea it was offered) you are out the price of the muffler and installation cost. I would suggest you stay with flowmasters, great sound and company warranties there product and stands behind them also. Just my 2cents
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1972 chevy k10 4x4 longbed 4-inch lift, 3.73 front/rears, frame off nearly complete 1972 chevy k10 4x4 longbed parts truck, known as the "ugly green machine" 1990 GMC 3/4 shortbed ext cab Always in need of 67-72 parts in central ks. |
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#3 |
Registered User
![]() Join Date: Nov 2000
Location: chimayo, nm, usa
Posts: 898
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Like I said, performance is my priority. I won't be driving the truck in inclement weather. Someone tell me how exhaust can flow better through chambers than straight through.
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#4 |
Registered User
Join Date: Oct 2002
Location: Iowa
Posts: 71
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if rust-through is an issue, Magnaflow sells stainless steel mufflers too, and they run about $100 each. I know that is more than a flowmaster, but that would be my first choice. 72step, you're right, flowmasters aren't the best performing mufflers, and I don't really like the sound either; you can hear that they are all metal........
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#5 |
newly minted old timer
Join Date: Dec 1999
Location: Hudson WI
Posts: 3,511
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rusted out? im shocked. i love mine, one of the selling points was how well built they were. i did pay the high retail of 160 or so but they are awsom. here is a link to a post with some sound files
http://67-72chevytrucks.com/vboard/s...ighlight=video
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____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban |
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#6 |
Registered User
Join Date: Feb 2003
Location: Bremerton, WA
Posts: 86
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72step
You are absolutely correct that a straight line is the best option for exhaust flow. That is why racing applications such as NASCAR and NHRA Top Fuelers use pipe/header setups as straight as possible. The problem with this, is the noise. All mufflers, no matter which brand, are all about cutting the noise with a minimal effect on performance. Some are better than others. I prefer Flowmasters. Good exhaust note with very little exhaust friction. ![]()
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'72 GMC C20, "2500 Super Custom", Custom Camper, New 454 '93 K2500 Suburban, Old 454 (157K) |
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#7 |
67-72 Addict!
Join Date: Feb 2002
Location: The TAX State!
Posts: 7,857
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Magnaflows sound awesome but I have heard complaints of rotting very quickly.
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Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads |
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#8 |
Registered User
![]() Join Date: Nov 2000
Location: chimayo, nm, usa
Posts: 898
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I talked to the guy again today, and he said there's a special 99 bucks a piece installed till the end of the month. Is that good?
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#9 |
Registered User
Join Date: Aug 2002
Location: Santa Fe NM
Posts: 393
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i d say maganaflow is the best i have seen these cut open and its a straight threw design i have seen flowmasters they have alot of chambers i like magnflow thats what i run
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68 GMC-Stripshow 70 Chevy Monte Carlo 72 Chevy Monte Carlo LOLO 72 Chevy Suburban Blurban 74 Vw Bug 78 Chevy k10 lwb 78 Chevy k10 swb 03 Cadillac Escalade-Duecesix 84 Cadillac Coupe Deville DeElegance ![]() ![]() B.O. A Lifestyle Money Cant Buy! Win,Lose, or Tie I'm a Raider till i die |
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#10 |
Registered User
Join Date: Jan 2003
Location: Seattle WA
Posts: 1,466
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I bought my 66 Chevelle race car with 3 1/2" Dynomax straight through race mufflers and side exit pipes...way too loud for the street. So, I had custom exhaust done all the way back out under the bumper using 3" tubes and straight-through magnaflows. The car doesn't seem to have suffered from the increase in backpressure and it sounds great. Obviously this car doesn't get driven in the rain so I am not concerned about rust.
I have 2 chamber flowmasters with 2-1/2" tails on my 71 Cheyenne 350. I do like the sound of them except that there is a sweet (or not so sweet) spot around 1800 to 3000rpm where those flows boom the cab. My wife says she can hear me coming a block away (on a completely stock, worn out 350). I like the sound though (tone not volume). This probably isn't helping much but, when I change my motor in my Cheyenne to a big block I will most likely go to magnaflows.
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