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Old 11-17-2009, 10:24 PM   #1
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Hole In Exhaust Pipe

On my old Prelude I had a hole in the exhaust pipe from water erosion and because of the hole my car sounded like it had an aftermarket muffler on it.

So my question is what would happen if I drilled a small hole in my Mustang's exhaust pipe?
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Old 11-18-2009, 10:19 AM   #2
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Re: Hole In Exhaust Pipe

We did this on a '99 GT on the stock mufflers. It will probably give a louder sound. The whole has to be larger than pin size, figure an inch or so and a few of them. We even went as far as to cut holes in the mufflers and pipe.

It's what the kid wanted!
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Old 11-18-2009, 10:47 AM   #3
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Re: Hole In Exhaust Pipe

i wouldnt drill a hole, if you really want to do something cheap then have a shop cut out the muffler and stick a pipe between where it was.
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Old 11-18-2009, 12:17 PM   #4
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Re: Hole In Exhaust Pipe

Yah you can get away with cheap mods like that on the v8's...someone did that up here on a GTO, but I wouldn't on a v6. It's just going to make it sound like crap. I'd either swap the single stock muffler, (relatively cheap) or do as SpectorV said and replace it with a pipe. I'd take that pipe and have it bent downwards so the exhaust tone reverberates off the ground = deeper tone at idle and in the lower rpms.
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Old 11-18-2009, 11:48 PM   #5
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Re: Hole In Exhaust Pipe

How loud does it get when you just replace the muffler with a pipe? Is it legal?
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Old 11-19-2009, 07:44 AM   #6
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Re: Hole In Exhaust Pipe

Spend $25-$30 on a Cherry Bomb or similar glasspack; you'll get the sound you're looking for and you'll remain somewhat "noise" legal. I wouldn't just weld or clamp in a straight pipe; your engine needs some backpressure.
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Old 11-19-2009, 07:44 PM   #7
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Re: Hole In Exhaust Pipe

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How loud does it get when you just replace the muffler with a pipe? Is it legal?
It would be significantly louder since you're removing that muffler that's restrictive as hell, but not illegal because you still have all 4 cats.

Metallic Mist did mention a good point though, you probably will want some sort of muffler to retain backpressure. I'm not too sure about CherryBombs or glasspacks though, they really do sound like a pissed off honda when put on a v6 mustang. I'd spend a little more and go with a Flowmaster or a Pypes or even a Spintech muffler instead. It will sound better.
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Old 11-19-2009, 07:51 PM   #8
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Re: Hole In Exhaust Pipe

I now that in some cases you loose power if you don't have enough back pressure, but my question being at what point will a open exhaust benefit you? You never see a race car running a full street legal exhaust. They sell kits that you can switch from your street legal exhaust to wide open, wouldn't this give you little to no back pressure?
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Old 11-22-2009, 01:28 PM   #9
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Re: Hole In Exhaust Pipe

Ghetto would deflty be the word for wanting to cut holes in exhuasts lol. You want a loud mustang take of mufflers and cats and you get dumps very very loud.
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Old 11-23-2009, 01:25 PM   #10
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Re: Hole In Exhaust Pipe

The open exhaust kits were big back in the day of big cube motors and leaded gas. I believe that the consequences of running an open exhaust on modern, high-temp, unleaded-burning engines include burnt valves among other things. As for a race car running open exhausts, that's why: they're race cars and they get rebuilt or fresh motors after a handful of runs. I put a glasspack on my old '89 Isuzu pickup, and it didn't sound too bad for a 4-banger. A Flowmaster on a V-6 is tricky; they sound like crap too if there isn't enough "flow" to make them work properly. The OP just needs to decide which route to take.
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