LT1-LT4 Modifications 1993-97 Gen II Small Block V8

exhaust popping....

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Old Nov 29, 2006 | 05:09 PM
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Default exhaust popping....

i have some pacesetter LT's with matching Y-pipe w/3" pipe into a 3" bullet (magnaflow) dumped just before the axle. its EXTREMELY "poppy".

will adding 2 1/2" pipe over the axle into another bullet muffler help get rid of the poppiness??? i love the sound of my bullet....just not at high rpms when it gets really "poppy".


oh yea...and it backfires if i rev it really quick???
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Old Nov 29, 2006 | 05:14 PM
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Mine does the same thing, but not as much as you describe. I have the same exact setup, but with a Dynomax Bullet, with a 2.5" turn down. It's just really open, if you want to get rid of the pops, that might work. It just needs a little more back pressure.
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Old Nov 29, 2006 | 05:22 PM
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popping is a normal thing with LT1's.

merv, you have a single dump? i was thinking on doing that setup too.
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Old Nov 29, 2006 | 05:26 PM
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normal thing with LT1 that have open exhaust
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Old Nov 29, 2006 | 06:09 PM
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Mine had it with the stock SS exhaust but was harder to hear/recognize it. Now the Pacesetter LTs and TSP x-pipe there's no hiding it but, usually only happens when I downshift and let the engine slow me down "pop-pop-pop"... You can hear it in my video clip a little. I'm not to worried... not sure if I should be though... any thoughts?
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Old Nov 29, 2006 | 06:14 PM
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Yea I get some pop-pop taking off around 2500 -3000 rpm in like 2nd gear.
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Old Nov 29, 2006 | 07:09 PM
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im running straight through exhaust, 1 high flow cat, no muffler or bullet and it does the same. and its exactly like everyone said its just a lack of back pressure.
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Old Nov 29, 2006 | 07:21 PM
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good oil pressure, and nice SES light from the o2 sensors lol

Originally Posted by hyperzone
Mine had it with the stock SS exhaust but was harder to hear/recognize it. Now the Pacesetter LTs and TSP x-pipe there's no hiding it but, usually only happens when I downshift and let the engine slow me down "pop-pop-pop"... You can hear it in my video clip a little. I'm not to worried... not sure if I should be though... any thoughts?
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Old Nov 29, 2006 | 08:14 PM
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i have the stock exhaust, i used to have a popping sound when the revs were coming down (like if revving in neutral), since my tune.. no popping at all.

Last edited by Ironxcross; Nov 29, 2006 at 08:19 PM.
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Old Nov 29, 2006 | 08:18 PM
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mine pops a lot when revving and such with stock headers and a borla catback..
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Old Nov 29, 2006 | 08:21 PM
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Originally Posted by Revelation Z28
merv, you have a single dump? i was thinking on doing that setup too.
Yea, it's a single dump. I have it opened up, then again I have a Cam, so I am using it a little better. It sounds deep when its going down the track, people thought it was a stroker. No one believed it was only a Hot Cam.
This is a vid, this is the old motor. The new one is a little more crisper.
Click on it...
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Old Nov 29, 2006 | 09:16 PM
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how much did it cost to do it? just for the bullet and turndown?
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Old Nov 29, 2006 | 10:07 PM
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ok ... good. im glad im not the only one with this. i didnt think it was a problem....just wonderin if there was a way to help make it a lil less noticeable. my second bullet should be here sometime next week and i will def be adding it after the axle.

hopefully i can "hide" it up high. like really close to the frame rail. i really love the clean look of nothing under my bumper!
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Old Nov 29, 2006 | 11:20 PM
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Originally Posted by Revelation Z28
how much did it cost to do it? just for the bullet and turndown?
Like maybe $70 at the time. I got the Headers and the Y pipe and did that myself.
This is a pic of it from the back.

Last edited by the_merv; Nov 29, 2006 at 11:28 PM.
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Old Nov 30, 2006 | 01:28 AM
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the popping is the stock tune. It is PIG RICH and needs tuned down a bit and it will stop. Some guys also have had good luck with H and X pipes calming it down a bit.
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Old Nov 30, 2006 | 02:02 AM
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its just the exhaust up over the other side of the rear end and dumped? where do you have the turndown?

Originally Posted by the_merv
Like maybe $70 at the time. I got the Headers and the Y pipe and did that myself.
This is a pic of it from the back.
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Old Nov 30, 2006 | 06:47 AM
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If you look close, it's actually infront of the Axle. Kinda hard to see it, here is a pic of the complete Exhaust setup. Now that I think about it, I think it's a 3" turn down. This will give you an idea..
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Old Nov 30, 2006 | 02:57 PM
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i was thinking on doing it with stock manifolds, or mids.
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Old Nov 30, 2006 | 05:04 PM
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Originally Posted by the_merv
Mine does the same thing, but not as much as you describe. I have the same exact setup, but with a Dynomax Bullet, with a 2.5" turn down. It's just really open, if you want to get rid of the pops, that might work. It just needs a little more back pressure.
I have the exact same setup as you
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Old Nov 30, 2006 | 05:57 PM
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You know as well as I do that it is loud and deep.. You can hear the Cam very well.
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