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Old 03-04-2012, 08:44 PM
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Glass packs or thrush weled mufflers

I have a 02' GMC Serria 2500HD 6.0 with true 2.5" duals, dual resonators and dual catalytic converters going into a single large muffler going back out into dual pipes. It's not loud enough for me. I want something with some good sound decently loud but not obnoxious. I'm going back and forth between a set of medium length glass packs ( like 18") or a pair of thrush welded mufflers. I don't want the annoying "blap" sound or the popping but I still want to be heard


What do you think?

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Old 03-05-2012, 03:52 AM
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I think you will like the sound of them for about a month or so and then they will burn out and they will get obnoxiously loud. If It was up to me I would put on a dual in dual out flowmaster 40 series or a Flowmaster Super 44. It is a little quiet at first but after a little time I think that will be a the noise you will be looking for. A nice rumble that will let everyone know your coming and and when you mat it you will really be heard.

I know I have 1 3/4" headers going into 3" exhaust no cats and into 18" glass packs and its redicously loud when you put your foot into it.

anyways its just a suggestion i know from experience so thats why im changing to a 40 series Flowmaster

hope this helps

Ed
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Old 03-05-2012, 07:25 AM
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Thank for replying, I have a muffler ver similar to what you mentioned, and since the truck has the resonators plus the cats, it just not very loud at all, it has a soft tone, and if I get on it it sounds descent but it's just too quite
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Old 03-05-2012, 12:10 PM
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I would give the muffler time to break in and maybe update your tail pipes to 3" and 3.5" tips
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Old 03-05-2012, 06:57 PM
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I've had the truck (with same exhaust on it) for 5yrs, and it has 3.5" tips on it now. i've always wanted it to be louder but couldn't justify spending 450-500.00 on exhaust that there was nothing structuraly wrong with. but now the exhaust hangers have rusted and broken loose of the pipe, causing a hole. so now i can justify getting the louder exhaust i've wanted.

another guy where i work had the 2-in/2-out flowmaster 40's put on his truck with 2.5" pipe and 3.5" tips about 3 months ago, and it sounds decent (slightly louder than mine) but it's still isn't very loud. i would be aggrivated if mine came out sounding like his, he even wishes his was louder.

I seriously think that the fact that these trucks have a dual resonators, and dual catalytic converters makes them a bit quiter from the start
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Old 03-05-2012, 07:25 PM
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I fully understand what you mean about the glass packs on your vehicle. my play toy is a 87' camaro with a 385cid that also has full length 1 3/4" primary headers going into 3" pipes but i dont have glass packs i have the dynomax 16.5"x4" bullets, that runs 11.20's and yes it certainly is loud. I wouldn't not want my truck to be that loud, but i think when you combine the resonator, catalytic converter, and either the glass pack or the thrush welded muffler it will muffle a heck of a ton more than just glass packs sitting on straight pipe.

you mentioned you wanted to put flowmaster 40's on your vehicle. you should do some research on how the flowmasters acutally flow vs some of the other brands. you will find that they are next to the bottom of the list when it comes to CFM. now i dont believe in paying 100+ for a single muffler like you would with Magnaflow, but dynomax (who makes thrush) makes mufflers extremely similar the 40 has but yet acutally flows much better and cost about $20-30.00 cheaper.

the thrush welded, and the dynomax ultra flow welded
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Old 03-06-2012, 07:06 AM
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I see what you mean with the mufflers I looked at the cfm charts bah...!! anyways I would put the thrush or cherrry bomb on with 3 inch tail pipes. the bigger the tail pipe the louder it will be.
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Old 03-06-2012, 07:56 AM
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You could remove some of the resonators or something. Probably not the cats because newer motors need those to run right (i think?) thrush glass packs are what i have on my truck, but they have that popping (which i like) so you wouldn't go with those. Turbo mufflers are too quiet, I've tried some before. Look between flowmaster and magnaflow, they have some decent priced mufflers that will sound good on your truck. If you want louder, i'd separate and go with two mufflers instead of one
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Old 03-06-2012, 05:31 PM
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I had an 02 Silverado 2500HD. My truck had dual 3" from the factory into the stock muffler with the single tailpipe. My truck didn't have resonators on it and I had dual tail pipes with a magnaflow muffler with the built in x pipe installed. Well it sucked, the guy at the shop necked it down to 2.5 pipe and it was barely louder than stock. I finally got p'd and cut the muffler off and welded in straight pipes, with the cats. It's sounded like glasspacks after that, which I don't really like but at least I could hear it.
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Old 03-06-2012, 07:31 PM
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Glass packs or cherry bombs will give you the snapping popping noise.

Around here, lots of guys just run twin tailpipes after the converters with no mufflers.
The converters quiet them down enough for Me, but I like to hear the pipes.
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Old 03-06-2012, 07:46 PM
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The thrush welded mufflers are almost identicle to the flow master 40's but yet flow much better, they are not the same as the thrush turbos the turbos are a little above stock. What I have decided to do is go with the thrush welded mufflers and I have spoken to the owner of the shop doing the work and he is okay with letting me hear it after the muffler install to see if it loud enough, if it's not them they will remove the resonators and just weld straight pipe in its place
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Old 03-06-2012, 09:09 PM
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Not all of the Magnaflows are $100+, those are the stainless steel polished mufflers. They make a aluminized steel muffler as well for much cheaper. If you did get the stainless mufflers, I have two on my 357sbc powered CJ7, they will last longer than the rest of the piping. Go with the shorter ones for louder and as someone else suggested, can you try omitting the resonators before trying anything else? Cut them off and replace with pipe
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Old 03-07-2012, 06:54 AM
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Good choice there man, just keep workin on it till it sounds the way you want. My friend and i had a phase where we wanted to have the loudest trucks around, we must have changed our set ups 8 times between the two of us... Its all fun with exhaust!!! good luck
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Old 03-07-2012, 10:30 AM
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Quote:
Originally Posted by southshore30
Not all of the Magnaflows are $100+, those are the stainless steel polished mufflers. They make a aluminized steel muffler as well for much cheaper. If you did get the stainless mufflers, I have two on my 357sbc powered CJ7, they will last longer than the rest of the piping. Go with the shorter ones for louder and as someone else suggested, can you try omitting the resonators before trying anything else? Cut them off and replace with pipe


i just looked up the mufflers you are talking about and they are still 75.00 a piece, where as the thrush welded mufflers, made of the same material, are 37.00 a piece. i'm not much for paying twice as much for a name. and with magnaflow that is exactly what you are paying for.
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Old 03-07-2012, 05:58 PM
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exhaust

I agree with jsaw. Why not just eliminate the muflers (and possibly the resonators) and keep just the cats. My son had a shop do that on his F150 and it sounded great. Many others around here do the same with Dodge Rams and GM trucks and get a nice exhaust sound.
Terry
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