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Flowmaster sidepipe 13530320 Question
Hello!
I need some information about the flowmaster 30 inch sidepipe replacement muffler. How much quieter are they, than the original backdraft sidepipe? The problem is, that I need a quieter solution for my roush 402r engine, because otherwise my neighbors probably get angry after a while! Does anybody has some soundfiles of it in comparison to the original setup? Would be glad to get some information from backdraft drivers! Thanks |
This has been well covered. Search 'Flowmaster Slimline' on CC and you'll find links to videos with sound level measurements, etc.
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Maybe you should be looking for information regarding a good realtor. If your Roush 402 with stock Backdraft exhaust upsets your neighbors I don't think you will never find a solution that meets their expectations.
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OTOH, I don't rev the engine unnecessarily and I drive very sedately around my neighbourhood, both coming and going. BTW, I was on a first name basis with virtually everyone on my cul-de-sac before I bought the Cobra, and I maintain those relationships. I'd much rather have them approach me with a complaint than calling town council or the local law authorities. |
Flowmaster mufflers
I just added flow masters because my car was so loud the would not allow us to run in the Goodguys autox in Del Mar Ca. They really quieted the car down especially the high frequency portion of the sound spectrum. It probably took out about 100 hp too but that isn't a big problem because my car is so traction limited already. I liked the old sound better but you can't fight city hall.
Bottom line they work |
just installed those mufflers on my car, quieted down a bit and got rid of the high frequency. Still sounds good. As far as taking away horse power, I don't think so.
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Thanks for the infos! At the moment I don‘t have problems with my neighbors, but if I can avoid any problems I will take care of it. The thing is, you can‘t start the engine in the morning, without waking up the peoples. But if I can get it quieter at idle and don‘t have the high frequencies it would be great to run out of my neighborhood without getting into trouble. Do you have pictures of your cobra with flowmaster installed cobra3170 and hotrodyankee?
Thanks |
I don't have them on the car at the moment, took them off to have them ceramic coated.
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I’m traveling this week but will post couple of pics on Friday
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Perfect!
Thanks spdbrake |
Flow Masters
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https://www.youtube.com/watch?v=kebN14i7MAA |
The Flowmasters flow much better than the stock BDR mufflers having only two 7/8" perforated holes...
http://www.clubcobra.com/forums/pict...ictureid=17467 They do come unpolished so plan on spend some time sanding and buffing http://www.clubcobra.com/forums/pict...ictureid=17464 And they are a bit larger ID than OD of the pipes. I took mine to a muffler shop and had forward pipe and tail spouts expanded a bit. (Don't push it they can crack) You won't get a perfect slip fit but the welds won't be enormous. Ensure you install the muffler with the short depth cone on the inlet. https://www.youtube.com/watch?v=Xuww8Yjyzsk http://www.clubcobra.com/forums/pict...ictureid=17468 While your at it you may want to change the rubber support mounts. Bosal PN 255-481 $2.00 per most everywhere. http://www.clubcobra.com/forums/pict...ictureid=17466 I added a hose clamp around the mount. Just snug enough to keep it in place and reinforce the mount from tearing. http://www.clubcobra.com/forums/pict...ictureid=17465 http://www.clubcobra.com/forums/pict...ictureid=17420 Sound data from a earlier thread http://www.clubcobra.com/forums/back...ml#post1425365 Last thing: These are 1/2" larger OD than stock and the heat shields won't fit without re-contouring and larger clamps. They run a lot cooler with the Ceramic insulation in the case but my wife still got a pretty good Snake bite getting out of the car... |
They added power based on a FFR post. This was done via engine dyno, 18 hp. Over glasspacks
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Horse power
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Please explain. |
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I guess the only way to really test this would be on a chassis dyno but the data and pure "seat of the pants" says we are down on power. This car can blow a pylon down with the 2.5" ID steel packs it can't with the Flowmasters so I am guessing exhaust volume/velocity is reduced which will kill power . |
Personally, I love the "Pylon Test".
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I got my flowmasters sidepipes 30 from summitracing and need to know, where the inside and where the outside of the pipe is. There is one longer and one shorter cone installed!
Would be glad to get some more information. Thanks Marc |
Short cone is inlet.
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