Cracking Glasspacks by squirting water in them while hot - Forums at Modded Mustangs
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post #1 of 23 Old May 17th, 2010, 07:11 PM Thread Starter
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Cracking Glasspacks by squirting water in them while hot

Is that a bad thing to do? I have glasspacks on my '07 GT and I love the sound, but its not nearly loud enough. . .you can't even hear me in traffic. Several guys have said to get the engine warm and squirt water in each side (I presume with a garden hose, do I need to use a high-pressure hose at the carwash?), get in and rev it up, and if its not loud enough do it again.

From what I gather, all its doing is cracking the glass insulation inside since the glasspack is a straight flow-through style muffler and depends strictly on the insulation to muffle the exhaust.

Is there any reason not to do this? If I do will it sound the same but with more volume or will is just sound like a raunchy old worn out muscle car? Please advise!
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post #2 of 23 Old May 17th, 2010, 07:14 PM
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Haha, thats a old-school trick I've heard about from my parents...


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post #3 of 23 Old May 17th, 2010, 07:15 PM
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take your cats off.

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post #4 of 23 Old May 17th, 2010, 07:45 PM
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I have heard about this, people do it on bikes. Idk that will will sound better but it should be louder. Just don't let the motor stall out if you try this.

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post #5 of 23 Old May 17th, 2010, 09:00 PM
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I did this once a long time ago. Ah........memories, I really liked that car ('70 Dodge Challenger RT/SE, 440 w/port injected nitrous and dual Holley 490's sticking out of the hood). I used to get tickets for loud exhaust all the time, being the punk kid that I was. I was telling UrbanRedneck earlier today that I used to stuff wads of steel wool in there whenever I would get a ticket and I needed to get it signed off that it was fixed. What was cool about it was after I got the fix-it ticket signed off, I would drop it into 2nd on the freeway with a shot of nitrous and see two little glowing balls come shooting out of your tailpipes. Boy we were cool back then. Anyways, yes it works. Only issue that you may encounter is that once you start removing some of the fiberglass packing it tends to weaken, and over time it may continue to get louder and louder as you loose more fiberglass. This tends to happen anyways with glass packs, but you will just accelerate the process.


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post #6 of 23 Old May 17th, 2010, 09:06 PM Thread Starter
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Yeah, but if you take the cats off and get caught, the fine is as much as a new GT!

Surely there's no way water could go far enough in to cause engine trouble, right?

Last edited by RMJ22; May 17th, 2010 at 09:08 PM.
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post #7 of 23 Old May 17th, 2010, 09:07 PM Thread Starter
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Thanks Boss, so there's nothing to worry about as far as damaging the engine, right?
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post #8 of 23 Old May 17th, 2010, 09:10 PM
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Originally Posted by RMJ22 View Post
Yeah, but if you take the cats off and get caught, the fine is as much as a new GT!
just dont get caught.

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post #9 of 23 Old May 17th, 2010, 09:14 PM
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Yeah, but if you take the cats off and get caught, the fine is as much as a new GT!
It's just a fix it ticket on local level. There are much bigger fish to fry on the big scale like that little oil leak offshore.
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post #10 of 23 Old May 17th, 2010, 09:27 PM
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Thanks Boss, so there's nothing to worry about as far as damaging the engine, right?
Nope. But watch out for the steam. Steam, though at the same temp as boiling water, has 100 times the heat energy in it when it condenses back into water on the back of your hand as you are squirting water up there.


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post #11 of 23 Old May 17th, 2010, 09:51 PM Thread Starter
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Cool, so do I use garden hose or high-pressure car wash hose?
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post #12 of 23 Old May 17th, 2010, 10:37 PM
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I think when I did it I used a kind of wand thing my dad had to wash the car with. You know, one of those things that you screwed the little jar of soap on the bottom and it had a little three position valve on it; off, rinse, & soap, something like that. It was an 18" aluminum tube with a little plastic fan nozzle on the end. I used it because I could stick it way in there before I squirted my load in there. Sounds like an epic letter to Penthouse. Anyways anything will work, I guess, seeing as we don't have a lot of tailpipe to deal with, but I would use something that you can control the flow of water with. I wouldn't just jam a garden hose in there and crank it on.

Why would you not just go get some different mufflers though? I kind of equate this to when we used to run a baseball bat around the wheel well to get clearance for some big slicks. It worked, but it's kind of ghetto, no?


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post #13 of 23 Old May 17th, 2010, 11:26 PM
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New muffles cost money this is free and he just wants a little louder lol, I have done this to my dynomax and it really doesnt change alot. If they are already broken in then you probably wont notice a big difference in sound.
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post #14 of 23 Old May 18th, 2010, 01:22 AM
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I've heard that if you rotate the glass packs and run them backwards, they are basically straight through. Haven't tried this though.
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post #15 of 23 Old May 18th, 2010, 10:09 PM Thread Starter
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Yes, its a lil ghetto, but I like the way glasspacks sound. And I haven't had the opportunity to hear and talk with other Mustang owners about their exhaust setups yet. Maybe one of these days I'll make it to a Mustang show, but right now I don't want to spend alot of dough on an exhaust system not knowing if I'll like the sound. Glasspacks give me the sound I like, at least for now. . .thanks for the advise!

BTW, I tried it and I like the results!! Its the sound I'm looking for. . only thing is I want it louder. I didn't use much water because I was being careful, but there was steam and out came the sound. Should I do it some more with more water? HOW MUCH WATER IS TOO MUCH??
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post #16 of 23 Old May 18th, 2010, 10:54 PM
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Quote:
Originally Posted by RMJ22 View Post
Yes, its a lil ghetto, but I like the way glasspacks sound. And I haven't had the opportunity to hear and talk with other Mustang owners about their exhaust setups yet. Maybe one of these days I'll make it to a Mustang show, but right now I don't want to spend alot of dough on an exhaust system not knowing if I'll like the sound. Glasspacks give me the sound I like, at least for now. . .thanks for the advise!

BTW, I tried it and I like the results!! Its the sound I'm looking for. . only thing is I want it louder. I didn't use much water because I was being careful, but there was steam and out came the sound. Should I do it some more with more water? HOW MUCH WATER IS TOO MUCH??
I am running glasspacks/resonators as well with SLP LM for the tips. I bought the glasspacks to cleanup the sound a little. I also have MACS which sound awesome mated with the resonators/glasspacks.

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post #17 of 23 Old May 18th, 2010, 11:52 PM
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Originally Posted by jahudso2 View Post
I've heard that if you rotate the glass packs and run them backwards, they are basically straight through. Haven't tried this though.
I don't believe there is a front or back to most glasspacks.

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post #18 of 23 Old May 19th, 2010, 12:54 PM
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Quote:
Originally Posted by RMJ22 View Post
Yes, its a lil ghetto, but I like the way glasspacks sound. And I haven't had the opportunity to hear and talk with other Mustang owners about their exhaust setups yet. Maybe one of these days I'll make it to a Mustang show, but right now I don't want to spend alot of dough on an exhaust system not knowing if I'll like the sound. Glasspacks give me the sound I like, at least for now. . .thanks for the advise!

BTW, I tried it and I like the results!! Its the sound I'm looking for. . only thing is I want it louder. I didn't use much water because I was being careful, but there was steam and out came the sound. Should I do it some more with more water? HOW MUCH WATER IS TOO MUCH??
Well as long as you don't fill up the exhaust with water you should be OK. Too much might be if you make it too loud, I guess. And remember, the more you remove, it may change up not only the volume, but the tone as well,.


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post #19 of 23 Old May 19th, 2010, 02:19 PM
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post #20 of 23 Old May 19th, 2010, 02:30 PM
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Lol. I havent heard about anyone doing this in the longest time...
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