mufflers-baffles ??
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mufflers-baffles ??

  1. #1
    Senior Member 1975sleekcraft's Avatar
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    Default mufflers-baffles ??

    i bought these ot headers used and they didnt come with baffles. i love the way they sound now. i would like to get some mufflers or baffles, just to have, incase some cop frowns on the noise factor.
    my questions are,
    what baffles or mufflers will bolt up to my headers????
    which ones lower the noise without raping HP????
    and where to get the best deal on the ones u prefer????

    my headers are made by hooker. they are 4" with a 5" bell on the end(whatever u guys call the flared end). i am runnin approx 450 horse.
    thanx for any and all input...

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    Senior Member gregb's Avatar
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    You have lot's of choices, since 4 inch is the most common size. Bottom line is anything that muffles the noise will cost some power, how much is subject to debate, and in reality you will probably not notice at that power level. I've run most of them, from those spiral deals to Supertrapps and cant say any ran different, but most of that was with a fairly stock engine. The spiral ones were the quietest. My choice anymore is the straight thru one, they probably cost the least power, of course they aren't cheap if bought new. I see them often here in the for sale section at reasonable prices.

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    Senior Member jetboatperformance's Avatar
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    Like Greg said theres lot of muffling devices to choose from out there , the majority will knock down the noise 8 to10 decibles depending on the engine itself (compression ratio etc) and how and where they are tested and for that matter who tested them (sae methods etc) a few years back we bought a certified decible meter and set about testing and found for example on Josh's and my boats we could get the from 110db or so down to around 90db with what most of us were offering , to get them down to 86db took internal Loovered mufflers and Drew Shot guns both , water injection helped bit may not be a factor on some types of test one might be subjected to, it would appear that many states have adopted the (j2005) Surprisingly although commonly thought to be a big HP "scrubber" however reports and feedback suggest (mufflers) don't seem to be all that bad , especially when contrasted against an expensive ticket or maybe a "boat and driver shake down inspection" by LEO .Lately we have been getting calls from alot of folks in different parts of the country saying they were denied launch altogether at public ramps in certain venues and in some localities weve heard OT pipes/ headers of any type are banned (private or municipal lakes). As much as I hate to face it the loud exaust noise I have always loved is likley going the way of lots of other things in this country Tom

    PS heres some things to consider when I spoke to a director for Harbor and Navigation a couple years back re this subject he said at that time training included comparing a loud boat (observation) to a gas lawn mower etc . some of the DB test we did at JBP just for S&Gs were to test Joshs 02 Silverado with a single stage cat back Flowmaster , it would have barley passed the "Dock test"

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    Senior Member 1975sleekcraft's Avatar
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    Quote Originally Posted by gregb View Post
    My choice anymore is the straight thru one.
    what are these called and or where can i find them???

  7. #5
    Senior Member gregb's Avatar
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    Well, you missed this set in the classifieds, they're gone but this is what I'd be looking for.....

    http://www.performanceboats.com//showthread.php?t=74080

    I've never been hassled for noise, but they always look when I launch locally to see if some kind of baffle is there.
    Last edited by gregb; 11-25-2010 at 07:30 PM.

  8. #6
    Senior Member 1975sleekcraft's Avatar
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    Quote Originally Posted by jetboatperformance View Post
    Like Greg said theres lot of muffling devices to choose from out there , the majority will knock down the noise 8 to10 decibles depending on the engine itself (compression ratio etc) and how and where they are tested and for that matter who tested them (sae methods etc) a few years back we bought a certified decible meter and set about testing and found for example on Josh's and my boats we could get the from 110db or so down to around 90db with what most of us were offering , to get them down to 86db took internal Loovered mufflers and Drew Shot guns both , water injection helped bit may not be a factor on some types of test one might be subjected to, it would appear that many states have adopted the (j2005) Surprisingly although commonly thought to be a big HP "scrubber" however reports and feedback suggest (mufflers) don't seem to be all that bad , especially when contrasted against an expensive ticket or maybe a "boat and driver shake down inspection" by LEO .Lately we have been getting calls from alot of folks in different parts of the country saying they were denied launch altogether at public ramps in certain venues and in some localities weve heard OT pipes/ headers of any type are banned (private or municipal lakes). As much as I hate to face it the loud exaust noise I have always loved is likley going the way of lots of other things in this country Tom

    PS heres some things to consider when I spoke to a director for Harbor and Navigation a couple years back re this subject he said at that time training included comparing a loud boat (observation) to a gas lawn mower etc . some of the DB test we did at JBP just for S&Gs were to test Joshs 02 Silverado with a single stage cat back Flowmaster , it would have barley passed the "Dock test"
    hey, do you guys have any type of baffles or mufflers lying around the shop??????? or have any deal i cant pass up???? kind of like gregb said, i would just like to have something, just in case!!

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    Got a pair of silencers from cp performance acouple years ago,they went into ot's from rewarder that were jet coated.After a couple minutes (just a hint of water in the line,steam) the ends of the headers started to discolor,waited till they cooled,turned of the water,headed back,then they got even worse,removed thm when they cooled,never used them again. (There the ones with the solid centers) in my opinion,POS,has this happened to anyone else?

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    rewarder and bassett both mfg mufflers for your application, have used both kinds from both venders with good results. agree with tom that this is a sign of the times, have chided some of the customers, do you want to buy the mufflers before or after you get the ticket.

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    Senior Member gregb's Avatar
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    Why not just give Tom a call? His number is at the bottom of his posts. My opinion, anything that puts up a wall so to speak, like the supertrapps or the CP mufflers, is going to hold more heat in the header. It's also going to produce some kind of pressure wave that heads back down the pipe probably compounding the problem. I never noticed discoloration but my headers are pretty old. I can tell you though that with the supertrapps they were very hot even with the water going thru, they seem much cooler (relatively) with the open center baffles. People in the back of the boat don't complain about it being too warm back there anymore. You can do what most of us have done, try several different sets of the cheaper ones, or go a different route and buy the better more expensive ones that you will eventually end up with from the gitgo.

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    Senior Member YumaJet's Avatar
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    boatless....

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    Member driptruck's Avatar
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    They just passed a 60 DB limit on a very popular lake here in Seattle. I think outboards idle at more than 60! Hell I talk louder than that. I run the baffels from Summit. You can even pack them with steel wool and get the noise way down. I'm sure they cost me HP but I run a stockish 454 with the family, and I want to boat.

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    Senior Member W.O.T's Avatar
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    Quote Originally Posted by YumaJet View Post
    Good Deal Do They Come In A Pair Or Sold Seperate Ya Think?

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    Default jr baffles

    sold seperatly, im running them and like em, but no hard data on sound reduction did make a differance though.

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    Senior Member W.O.T's Avatar
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    Quote Originally Posted by sleek460 View Post
    sold seperatly, im running them and like em, but no hard data on sound reduction did make a differance though.
    Thanks. Ive Been Checked Several Times And They Just Like To see Something In There Never Been Decibel Tested.

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