V6 (1994-2004) Mustangs Technical discussions on the 3.8L and 3.9L V6 torque monsters

Mac Long tube headers

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Old Sep 23, 2010 | 06:30 AM
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Default Mac Long tube headers

im about to do my long tube headers on my car are there any things i should prepare for or anythings i might need to know to make this easier, and one other question are u still able to reinstall ur egr system on the headers?
Old Sep 23, 2010 | 10:42 AM
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Ryan suggested taking off your upper intake to make it easier but I never did.
Check for clearance with the starter, some guys have had problems with this.
There should be a threaded bung for the EGR on one of the primaries.
Old Sep 23, 2010 | 11:19 AM
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ok thanks, do the long tubes make the car sound alot better ?
Old Sep 23, 2010 | 11:31 AM
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Yes. In short, haha
Old Sep 23, 2010 | 11:31 AM
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Oh they most definitely do.
Old Sep 23, 2010 | 11:34 AM
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sweet i cant to get it done, what about hp wise? noticeable?
Old Sep 23, 2010 | 11:40 AM
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are you putting high flow cats in? You will notice a bit of low end torque loss if your not but its not bad.
Old Sep 23, 2010 | 04:22 PM
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make sure your easy on the header studs, dont break one off in the head

the egr bolt on the header can be a bitch getting at with a wrench, it might be possible to run the egr pipe back on and tighten it with the header not bolted up yet and hanging down, not sure but if i was to do mine again i would definitely try that to make life easier.

make sure you have the o2 sensor extendors

make sure you have MILS or a tuner that turns off the rear o2 sensors

the long tubes should be able to get shoved up from underneath, not from the top

and obviously take out the intake tubing to clear up room to work

thats all i can think of, have fun and i know you will love the new sound
Old Sep 23, 2010 | 06:01 PM
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I don't have cats on my setup.
Old Sep 25, 2010 | 06:40 PM
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Originally Posted by Fink
are you putting high flow cats in? You will notice a bit of low end torque loss if your not but its not bad.
im using magnaflow cats on the set up



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