Exhaust replacement on a 1990 LE..suggestions? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 11-18-2006, 10:10 AM   #1
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Default Exhaust replacement on a 1990 LE..suggestions?

Ok, here'* the skinny. (Please actually read the details to avoid any confusion/arguments.)

Car is a 1990 Bonneville LE. Current exhaust system is stock with a single exit in the rear facia. What I would like to do is up the diameter of the entire system and replace the muffler and cat with less restrictive ones. (also change the exhaust note to something a little throatier.) The goal is to accomadate a higher flow through the entire system. Not even thinking of one of those silly resonator coffee cans on the tip.

My understanding thus far is the stock 2.25" pipes can be replaced with stock 2.5" pipes off a later model H-Body and the muffler can be replaced with an 4th gen F-body V6 muffler. Is this correct? If not, Plan B is to get the muffler dejur and have the pipes made up at a local shop.

How about muffler choices. I'm thinking along the lines of a Flowmaster, but not sure which series would sound nice on the V6. Sandrock'* 80 Series on his Malibu sounded rather nice.
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Old 11-18-2006, 12:40 PM   #2
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The best sounding LN3 we've ever heard was Jim W'* Red Light District with a Magnaflow on it. He may still have a vid for you.

Yes, the 2.5" will benefit you more, especially with a power-adder. Without the power-adder, you may lose low-end.
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Old 11-18-2006, 12:48 PM   #3
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Thanx,

I also have considered replacing my stock exaust system.

Our cars are basically the same, so I could use the advice too.

CD
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Old 11-18-2006, 12:52 PM   #4
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I'll take a look and see what I have. I had a Autosound high flow cat welded to the stock piping and a Magnaflow muffler for F-Body 3800'* (ie Firebird and Camaro)..works on many GM cars though. I also had a GMC Yukon Denali chrome tip. Gave the car a great look and great sound.
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Old 11-18-2006, 01:00 PM   #5
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Here ya go! Only vid I have of the exhaust...sorry man. Good luck with whatever you end up doing.



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Old 11-18-2006, 02:31 PM   #6
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Whichever muffler you choose (flowmaster 80 or magnaflow f-body) remember it is going to be loud, because you do not have a resonator.

I did the flowmaster 80 and a high flow cat on my '89. It sounds like a beast at idle, but had alot of drone at travelling speed.
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Old 11-18-2006, 04:29 PM   #7
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Curt, I like the sounds from brads car.... But as much as I liked the sound, the drone was a little more than I'd ever want...

I have been wondering for a while what my 95 would sound like with a Magnaflow keeping the Res...

Not sure what the size of the downpipe is on the 90-91...I'm thinking 2.5 for the DP and 2.25 for the rest... I do believe that a newer exahust should fit, but its a bit questionable... Not 100% on the length...

On another note I found a restriction on my old rear manifold from my 91....

* runs to find Manifold, Takes Picture *



Not sure if yours has this restriction... After I found a clean cut manifold from an 89 Buick I noticed a deeper tone.... The 92+ had a better rear manifold...


But a 2.5" exahust would be interesting

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Old 11-18-2006, 04:51 PM   #8
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I'm thinking all the LN3 manifolds have that restriction. Hacking it out has been found to make a worthy performance difference.

My '95 L67 manifold does not have it, if it helps at all
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Old 11-18-2006, 07:59 PM   #9
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i say put cherry bombs on it
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Old 11-18-2006, 08:35 PM   #10
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Quote:
Originally Posted by jr's3800
* runs to find Manifold, Takes Picture *
Thanks, I remember that from earlier and it'* on my list of things to check when the pipes get dropped. I figure if it'* like that, a die grinder will make short work of it.
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