94-98 VS 99-04 Header guide!

[Lando7886]

sorry neotokyo but i have to ask you this question(sorry because you are gettin bombarded...) i was thinking bout getting headers for my 01 with a new exhaust too. if i put 94-98 stock shorties what size does the x-pipe/midpipe have to be. i might not be completely accurate with this question so sorry ifi'm wrong with the wording of the question

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[SVTJohn]

How much of a performance uprade are they.(if any)

[TOKIV6]

excellent post, very informative, i got a few question,

i just order some 95 exhaust manifolds for my 2000,

the stock manifold has an egr tube in the front of the drivers side on, the 94-98 does not, so i was planing anyway on deleting the EGR, can any exhaust shop cover the egr holes?

my exhaust is basically the stock one until the catback, can i enlarge the flange and use it with my 00 exhaust manifolds so when i change them they bolt right up? or can i bolt the 2 flange at the 2 1/4 from the manifold and later opened them a bit.

what mid pipe can i get for this manifolds? any 96-98 mustang gt x/h would work, ? or does it gotta be one specifically for a 94-98 v6?

and the o2 sensors, can i tell the shop to cover the o2 holes on the 94-98 manifolds and leave them in the other tube? or the gotta be in the manifolds?

sorry for my question but i dont wanna run on any trouble when i install thanks!

[TOKIV6]

bump, anyone?

[crash]

dude, you are a legend in my eyes now!! thanks fo all that info, when i do it ill let ya know how it goes!

[cobra232]

ORIGINAL: TOKIV6

excellent post, very informative, i got a few question,

i just order some 95 exhaust manifolds for my 2000,

the stock manifold has an egr tube in the front of the drivers side on, the 94-98 does not, so i was planing anyway on deleting the EGR, can any exhaust shop cover the egr holes?

my exhaust is basically the stock one until the catback, can i enlarge the flange and use it with my 00 exhaust manifolds so when i change them they bolt right up? or can i bolt the 2 flange at the 2 1/4 from the manifold and later opened them a bit.

what mid pipe can i get for this manifolds? any 96-98 mustang gt x/h would work, ? or does it gotta be one specifically for a 94-98 v6?

and the o2 sensors, can i tell the shop to cover the o2 holes on the 94-98 manifolds and leave them in the other tube? or the gotta be in the manifolds?

sorry for my question but i dont wanna run on any trouble when i install thanks!

why delete the EGR? if an inspection station notices it's deleted they will fail the car.

an easy fix is to run high temp silicon emissions hose from the 95 EGR port to your EGR valve and you will need 2 small emissions hoses to go from the header to the purge valve. the easiest way to do it is to get an EGR tube from a 94-98 and cut it just above where the small nipples come off of it for the purge valve hoses. it will work with about $50 invested and be 100% emissions legal.


NEO must not have heard of early 94's coming with cast iron headers. some came with them and they have roughly the same dimensions as 94-98 tubular stock headers but they could be extrude honed smooth and opened up alittle for better flow. they are very rare. i have only seen 2 cars with them. the Haynes mustang manual has a pic of a 3.8 stang engine with them too

[MantaDreams]

ORIGINAL: NeoTokyo

If you dont have smog in your state get the Mac long tubes and the Mac midpipe. Get the one that fits yours year.

If you are a 99-04 Model and want shorty headers then get 94-97 headers and save a ton of money. You will need to do a little modification like extending the EGR tube and having a shop expand the collector flanges on the Y-Pipe.

Neo you have great technical advice on these headers for these years, but the bolded statement will mislead people. The requirement for catalytic converters is a federal law enforceable in all states. Any automotive mechanic doing vehicle inspections "could" fail your car without them. In some locations where states are required to do more pollution control (ozone nonattainment areas), more intense emissions control equipment inspections are required. A missing cat will immediately show-up under that kind of inspection, and you will be failed. Someone deleting cats and or putting in anO/R setup in a county of a state where these emissions inspections are not required is simply getting away with violating the law.

kinda like speeding where no law is present.

...

[TOKIV6]

ORIGINAL: cobra232

why delete the EGR? if an inspection station notices it's deleted they will fail the car.

an easy fix is to run high temp silicon emissions hose from the 95 EGR port to your EGR valve and you will need 2 small emissions hoses to go from the header to the purge valve. the easiest way to do it is to get an EGR tube from a 94-98 and cut it just above where the small nipples come off of it for the purge valve hoses. it will work with about $50 invested and be 100% emissions legal.

well, were i live they dont check for that, they only make sure you have your cats and thats it, so deleting the egr is no problem for me, i thought of it because is a lot easy than do all the process you said.

but what about the other stuff, what do you think?

[crysalis_01]

No sticky? Bump.

[cobra232]

ORIGINAL: TOKIV6

well, were i live they dont check for that, they only make sure you have your cats and thats it, so deleting the egr is no problem for me, i thought of it because is a lot easy than do all the process you said.

but what about the other stuff, what do you think?

if they check for the cats then your area requires the EGR to be intact too. Federal Law requires it to be intact and it really doesn't hurt performance so why not just use it???