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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 03-05-2011   #1 (permalink)
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Default Glasspacks on V8 289

Anyone running glasspacks on their 289 Mustang?

If so, what is your feedback.

Place them right after the H/X pipe or further down near the rear axle?

Will the glasspack length make any difference to HP/torque and sound/tone?

I am looking at Cherry Bomb, Flow Tech, and Jones glasspacks to run on my 66 289. I have OEM exhaust manifolds and 2 inch H pipe right now.
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Unread 03-05-2011   #2 (permalink)
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The longer the glasspack the smoother/more mellow the sound is.
 
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Unread 03-05-2011   #3 (permalink)
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i think glass packs are awful. My opinion though.
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Unread 03-05-2011   #4 (permalink)
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I run Cherry Bomb glass packs on mine 289 271hp, you can hear it 1/4 to 1/2 mi away if you put your foot in it, can't hear the radio if the motor is running, I love it. Good Luck.
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Unread 03-05-2011   #5 (permalink)
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Quote:
Originally Posted by Pig Muffin View Post
i think glass packs are awful. My opinion though.
Yeah, I hear ya; glasspacks get a bad rap because of their unique sound; you either hate it or love it, no in between.
I just pulled off a pair of Flowmaster knock offs that was put on by the previous owner because they sound too much like what everyone else has.
I like to try and set myself apart from what everyone else has but at times that can be hard when you own Mustangs.

thanks for the input.
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Unread 03-05-2011   #6 (permalink)
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Quote:
Originally Posted by rex1965 View Post
I run Cherry Bomb glass packs on mine 289 271hp, you can hear it 1/4 to 1/2 mi away if you put your foot in it, can't hear the radio if the motor is running, I love it. Good Luck.
rex1965,
What size/model Cherry Bombs you run?
My radio is already crappy, however, a great sounding and loud ride is music to my ears.
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Unread 03-06-2011   #7 (permalink)
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Default Radio

Quote:
Originally Posted by cavc View Post
rex1965,

My radio is already crappy, however, a great sounding and loud ride is music to my ears.

I like the way you think - My radio is already crappy.
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Unread 03-06-2011   #8 (permalink)
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I don't know what number mine are I just measured what dimensions I needed, like the inlet and outlet I.D. , and the length of the body and total length, went down to the local auto parts and got them, they are always more mellow when first installed. They are installed right in front of the tailpipes. Good Luck.
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Unread 03-06-2011   #9 (permalink)
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I have cherry bomb glass packs on my 66 and love the way they sound. I think glass packs sound bad on newer fuel injected mustangs.
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Unread 03-06-2011   #10 (permalink)
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The previous owner installed glasspacks on my 67 with a 289. I dont mind the sound, but I think when I install my new exhaust in a couple of months, I will switch to some Flowmaster super 40s or 44s. Something deeper and fuller. That is unless someone has a better idea. Now that I have a more grown up motor, I want some more grown up exhaust. Cherry bombs remind me of 1985.
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Unread 03-06-2011   #11 (permalink)
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I have 30 inch Cherry Bombs, H pipe and side exhaust. It is not really all that loud. The sound is a deep tone and not a "Ricer Whine" you hear on some imports.
Also running Tri Y headers.
Pictures and order info: Exhaust

Good Luck and BE Safe
Ron
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Unread 03-06-2011   #12 (permalink)
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When i got my car 10 years ago from the orginal owner, it had the shortest little red glasspacks ide ever seen. That thing was so loud you couldnt even hear yourself think. To be honest i think it screwed with the backpressure too. As soon as i found oem type mufflers and put them on, it ran way better and smoother too. it also caused ALOT of extra rattling inside the car. Had to retighten alot of screws on the trim pieces. I mean if you like it loud then thats your ticket. But be warned, it will grab alot of attention, even unwanted kind from the fuzz.
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Unread 03-07-2011   #13 (permalink)
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glass packs to me make hot rods sound like old farm truck or something.
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1968, 302 .030 / Comp Cams Magnum 270h #31-414-3 501 lift @ .050 dur 224/224
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Edelbrock 110gph Fuel Pump
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Unread 03-07-2011   #14 (permalink)
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I used to use the Thrush Glasspack mufflers back in the day when I was installing my own exhaust systems and they would just hang there before the rearend with no tailpipes. Used to get pulled over all the time by the cops for not having complete exhaust.
So you really don't want to know what I think about glasspack mufflers!:nogrinner
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Unread 03-09-2011   #15 (permalink)
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Quote:
Originally Posted by 66 restomod View Post
I have 30 inch Cherry Bombs, H pipe and side exhaust. It is not really all that loud. The sound is a deep tone and not a "Ricer Whine" you hear on some imports.
Also running Tri Y headers.
Pictures and order info: Exhaust

Good Luck and BE Safe
Ron
Ron,
Thanks for the pics and links. I was not thinking of side exhausts, only glasspacks/mufflers and turn downs just before the rear axle. You got me thinking now.

Cav
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