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downpipe on a stock exhuast?

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Old Oct 20, 2005 | 10:26 AM
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From: redondo beach
downpipe on a stock exhuast?

im just wondering if any gains could be made off a downpipe, stock cat, and stock exhuast? i know it's kinda working backwards than the norm, but has anyone tried it?
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Old Oct 20, 2005 | 10:31 AM
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I doubt many people have tried this method. I don't think anything will happen though, good or bad. But why would you want to? Wouldn't that be like puting a condom on AFTER sex? Might be harmless, but why do it?
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Old Oct 20, 2005 | 10:36 AM
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you might have a little faster spool, if your gonna do that, might as well get a test pipe at the same time (60$), at least then you'll start to make some hp before you get a catback.
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Old Oct 20, 2005 | 10:38 AM
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^+1 on the quicker spool and slightly more power ... and you'll still be emissions compliant ...
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Old Oct 20, 2005 | 10:40 AM
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I am going to try that this weekend. Long story, But I have to put back the stock exhaust and go for the inspection.
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Old Oct 20, 2005 | 10:49 AM
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Originally Posted by taenaive
I am going to try that this weekend. Long story, But I have to put back the stock exhaust and go for the inspection.

Shouldn't have a problem passing if you left an after market DP on with stock cat back? Could be wrong tho.
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Old Oct 20, 2005 | 10:50 AM
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I ran that way for a while after I removed my catback and put the stock catback on. I had slightly better spool up, about the same as when I had the aftermarket catback on. I believe the benefits are the same on a downpipe regardless of whether the catback is stock or not if you are going to run the stock catalytic converter.
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Old Oct 20, 2005 | 10:52 AM
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let me know how that goes! hahah
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Old Oct 20, 2005 | 11:00 AM
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There will be no gains with any combination of exhaust until stock cat is replaced.

That simple

And then after cat is removed, your really won't gain anything with a full 3" TBE, except for sound, until whp is up to say 350.

So basicall, removing that cat is the most economical bang for the buck for early mods.
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Old Oct 20, 2005 | 11:08 AM
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From: space
Originally Posted by Stevdalpiaz
There will be no gains with any combination of exhaust until stock cat is replaced.

That simple

And then after cat is removed, your really won't gain anything with a full 3" TBE, except for sound, until whp is up to say 350.

So basicall, removing that cat is the most economical bang for the buck for early mods.

So you're saying that a 3" TBE wont give you any gains and is mostly for sound? I can't wait to hear you explain this!
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Old Oct 20, 2005 | 11:12 AM
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Originally Posted by Stevdalpiaz
There will be no gains with any combination of exhaust until stock cat is replaced.

That simple

And then after cat is removed, your really won't gain anything with a full 3" TBE, except for sound, until whp is up to say 350.

So basicall, removing that cat is the most economical bang for the buck for early mods.

What about Buschurs BR330 and 350?...330 has a 2.5" dp, 2.5" exhaust with stock cat and 350 gets a 2.5" dp and 3" exhaust with stock cat, I believe. So how are they making additional power if you cant with stock cat?
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Old Oct 20, 2005 | 11:18 AM
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From: redondo beach
ok ive been thinking about it and i dont think i can do it. so lets say i get a 3"dp. i can't connect it to the stock cat cause it's 2.5. then if i get a 3" test pipe, i can't connect it to the cat back cause it's 2.5. so basically this blows =( haha
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Old Oct 20, 2005 | 11:21 AM
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Originally Posted by Stevdalpiaz
There will be no gains with any combination of exhaust until stock cat is replaced.

That simple

And then after cat is removed, your really won't gain anything with a full 3" TBE, except for sound, until whp is up to say 350.

So basicall, removing that cat is the most economical bang for the buck for early mods.
That is just illogical.
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Old Oct 20, 2005 | 11:24 AM
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From: Denver, CO
Originally Posted by Stevdalpiaz
There will be no gains with any combination of exhaust until stock cat is replaced.

That simple

And then after cat is removed, your really won't gain anything with a full 3" TBE, except for sound, until whp is up to say 350.

So basicall, removing that cat is the most economical bang for the buck for early mods.
Wrong! You should know how restrictive stock catback and downpipe are ... especially the stock muffler ... I do agree that the stock cat is restrictive but you can still make gains with just a downpipe and/or catback ...

Last edited by DaWorstPlaya; Oct 20, 2005 at 11:28 AM.
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Old Oct 20, 2005 | 11:25 AM
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I had a Helix downpipe with the stock cat and exhaust. Honestly I couldn't feel any difference, at all, nothing. Got the HFC and catback and a tune and I could really feel it then. So my point is I would never buy a downpipe alone and expect any performance gains. If you want to get it put on first cus you are getting a good deal or what ever and will be getting a cat and catback soon then go for it.
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