Anyone have a glasspack between their cat and muffler? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-25-2004, 08:33 PM   #1
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Default Anyone have a glasspack between their cat and muffler?

Has anyone without a factory resonator managed to add a cherry bomb or other type of glasspack in between the cat and the muffler? If so, how long is the glasspack and where is it mounted? Does it reduce the available ground clearance?

I've seen the idea discussed here... I took a look under my car and there doesn't seem to be much room for one. My car came without a resonator and I'd like to add one when I mod my exhaust.

Jeremy
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Old 06-25-2004, 09:07 PM   #2
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using a tape measure, measure the longest straight length of pipe after the cat. If you can fit one in place of the existing pipe then ground clearance wont be a problem, but if you have to reroute it then you might have some trouble.
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Old 06-25-2004, 11:53 PM   #3
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I was just talking to my exhaust guy about this a couple days ago. There'* room in the intermediate pipe right behind the cat, but if you put in a glasspack as a resonator, he advised to install it BACKWARDS. Better yet, buy a Magnaflow or other major brand resonator. Zero backpressure change, straight flow-thru. I'm either doing that, or going with resonator tips soon.

My car had no factory resonator. 94 was the first year for that.
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Old 06-26-2004, 12:15 AM   #4
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a resonator in the pipe will do more than one in your exhaust tips wont it?
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Old 06-26-2004, 01:05 PM   #5
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What does the resonator do? Wouldn't it just create backpressure? If I mod my exhaust is a resonator a good idea?
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Old 06-26-2004, 01:48 PM   #6
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The right resonator, properly installed, will not affect backpressure. It mellows out the tone of the exhaust, and takes the raspiness out.
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Old 06-27-2004, 11:09 PM   #7
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Quiets it dramatically.

The difference between my 93 and zzzzzeke'* 94 are amazing.

We've both installed the same flowmaster, he has 2 1/4" tubing with a res, and I have 2 1/2" tubing with no res. Mine was 2x as loud, but not raspy under load at all still. I think a 2 1/4" with no res may get raspy.

Side note, Ol' Blue eye'* with his 3" wide open Magnaflow on a supercharged engine, could not be heard parked next to my car with them both idling...

A Cherry bomb / glass pack will affect the sound, a true resonator will affect sound and quiet it.
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Old 06-30-2004, 05:51 PM   #8
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Just measured my pipe again, this time more carefully. It is actually 2.5" wide. I thought the SE had 2.25" piping...

Then I measured the straight section after the cat. I measured from the weld right after the cat, to the first point at which it starts bending. It was 13". So I'm off to find a cherry bomb or resonator under 13".
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Old 06-30-2004, 08:27 PM   #9
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Looks like mine will be installed during the West Coast BonneFest on Sunday July 18th. I should have before and after sound clips.
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Old 07-08-2004, 01:58 AM   #10
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I called around to a few parts stores and let me tell you, those guys really gave me attitude as soon as the words "cherry bomb" came out of my mouth! They immediately assumed I'm a ricer... they don't yet know how I plan to use it.

Just came across busmaster007'* legendary Cherry Bomb thread, the one that started it all:
http://www.bonnevilleclub.com/forum/...pic.php?t=5410

For some reason he had 23" of straight pipe behind his cat and I only have 13" or 14". Willwren have you measured yours yet?

It looks looks like there are no 2.5" in/out Cherry bombs that will fit. Thrush doesn't have one either:
http://www.supremeperformance.com/Pi...SPEC_CBomb.pdf
http://www.dynomax.com/documents/thrushglass.pdf

Jones makes a Thunderbolt glasspack that will fit:
https://www.fulllineexhaust.com/cgi-...&key=JONA4512S

...but I don't know whether the interior is perforated or uses baffles. Jones has a diagram but I'm not quite sure what to make of it:
http://www.fle-online.com/Informatio...lasspacks2.htm

I am itching to get this system complete! I have a Magnaflow cat on the way and am thinking of ordering a Magnaflow muffler. Flowmaster is out because I don't really want or need dual outlets.
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