Longtubes and emissions - hypothetical question - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 11 Old 05-09-2002, 10:36 PM Thread Starter
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Longtubes and emissions - hypothetical question

I know longtubes aren't emissions legal. Why is this, first of all? Is it merely because they eliminate the cats?

Can't you weld a bung on there for your O2 sensors? Seems there's plenty of room on the H pipe to move the converters a little further down if you wanted them. Also, another set of bungs could be welded in downstream of the cats for the two downstream O2 sensors as well.

I know the O2 sensors probably wouldn't get as hot a little further down the exhaust from their present location, but does this mean they won't function correctly?

If anyone decided to go this route, would there be tuning issues to be expected? I think it would be a relatively simple thing to do, and have the best of both worlds: headers that actually do something, and emissions legality. Since the usefulness of the shorty headers is dubious, if I ever install headers they'll be longtubes. But, they'll have to be made emissions legal enough to pass a sniffer test.

Opinions?


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Last edited by lo pony; 05-09-2002 at 10:41 PM.
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post #2 of 11 Old 05-09-2002, 10:48 PM
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With a catted H-pipe, they should pass the sniffer. Where you'll have a problem is the visual due to the removal of the factory cats from their "stock" location.


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post #3 of 11 Old 05-09-2002, 10:50 PM
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FYI, My buddy past his emissions with the LT's and a catted H pipe on a 98 GT.

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post #4 of 11 Old 05-09-2002, 10:58 PM Thread Starter
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Thanks for the replies. *Most*, but not all, of the ninnies that run the emissions testing booths don't know better, so it's possible to just have them look under the car and verify the cats are there - nevermind their location, I think.

When I took mine in, the guy was asking me all kinds of questions about the car - where I got it, what I paid, did I plan to mod the car, put exhaust on it, etc. LOL

I'll go back to him, I think. I asked him about the non-stock cats and he said "as long as they're there, but most importantly, as long as it passes the tailpipe test".

kcsburk, how did your buddy get his longtubes to work with converters? Like I mentioned? I see you're in GA as well...

That settles it guys. This will be the next mod to my car. Emissions legal longtubes. *chuckle*

Todd

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post #5 of 11 Old 05-09-2002, 11:58 PM Thread Starter
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ttt anymore takers on this one?

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post #6 of 11 Old 05-10-2002, 12:36 AM
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BBK sells a cated h-pipe for their long tubes.
Dan

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post #7 of 11 Old 05-10-2002, 12:40 AM
 
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I have longtubes and a catted h-pipe
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post #8 of 11 Old 05-10-2002, 12:44 AM Thread Starter
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What I'll probably do is just modify the VRS X pipe I already have and move the converters.

Now, which longtubes...

2016 GT, Perf/Prem, ruby red.
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ctfren ch @ iClo ud. n e t (remove spaces)
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post #9 of 11 Old 05-10-2002, 07:33 AM
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Quote:
Originally posted by lo pony
What I'll probably do is just modify the VRS X pipe I already have and move the converters.

Now, which longtubes...
I have longtubes with a modified Bassani X with cats and didn't have any emissions issues. Later Ron

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post #10 of 11 Old 05-10-2002, 07:52 AM
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I'm eyeing the BBK longtubes. Nice quality and not too bad a price. I've got a pic of the longtubes installed with a modified basanni x-pipe w/ cats still on if you want it. It's someone else's pic so I can't take the credit. Basically, it is what I plan on doing to mine. e-mail me if you want it. [email protected]

Also, FWIW, heard Basanni is coming out with a set of longtubes later this year. Should be high quality like all their stuff, but can you imagine what they will cost


- Brian
- 1998 Silver GT - Stage 1 ported PI head swap, bassani mid-length headers, bassani catted x-pipe, magnaflow muffs, chip tuned.
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post #11 of 11 Old 05-10-2002, 11:33 AM
 
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i just picked up a set of bbk LT for my cobra, they're almost too pretty to put in the car. really well built. nice welds and a really good flange. there are a couple spots of little balls hanging from the welding process but with a dremel and a little tap on them they'll be gone.
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