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GHL Exhaust/Bypass pipe Question

I'm sorry if this is a dumb question but I ordered the GHL single exhaust with 4" tip and a bypass pipe from two different companies. After looking at some pictures, it seems the GHL exhaust removes the cat anyway, is that right? And I wouldn't need the bypass pipe? If this is true what would I do with the 02 senor?
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Old 05-20-2007, 06:01 AM
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If you ordered the GHL you dont need the extra pipe... u would use the pipe if you wanted to replace the cat pipe and feed the factory muffler.

If you mount the muffler it will be right up to the turbo...

Have you removed the air pump and all the control valves and manifold air pipe??? The cat has an air line from a control valve that is part of the air pump system... I would suggest that you remove this stuff as you will get her up to 300 from 282hp...


Also since you are in Maryland you can get the car licensed as historical ( 20 yr) that way you will be exempt from MD emissions testing..so removing it would be a problem with the DMV.


Also you should order the euro spec muffler hanger for the new GHL muffler or you wont get it to fit with the original...The hanger is $26 or so... good luck with your mods.
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Old 05-20-2007, 01:24 PM
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Oh yeah the oxygen sensor ..isnt it on the primary pipe coming down the left side of the engine next to the valve cover... You are talking about installing GHL headers are you?
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1987 930 -Guards Red
2001 740I sport Blk
2011 F-150 supercrew Blk
2014 X3 2.8 white
"What goes around comes around..."
Old 05-20-2007, 01:26 PM
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Thanks for the Info. I went and jack it up and took a look. I'm only changing the exhaust so the 02 sensor will stay right? Now I did see the silver tube coming off the cat, pictured below. I guess I will have to remove this pipe? I see it hooks up to a rubber hose with a clamp holding it on. Do I just plug that hole that I removed the pipe from? Thanks for any Info I receive.

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16 VW Touareg
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87 Porsche 930
84 VW Rabbit GTI
Old 05-20-2007, 02:01 PM
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The pipe connects as you said.. the hose goes to a air control one-way valve that is vacuum controlled. It is on the right side of the engine compartment....I would say you ought to think about removal of all associated air injection equip ie emissions....
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1987 930 -Guards Red
2001 740I sport Blk
2011 F-150 supercrew Blk
2014 X3 2.8 white
"What goes around comes around..."
Old 05-20-2007, 04:09 PM
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Thanks. Any links that show me how to go about doing so. I just can't plug that one end?
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16 VW Touareg
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87 Porsche 930
84 VW Rabbit GTI
Old 05-20-2007, 04:41 PM
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