Mac Longtube outlet size? Need for H-pipe build

greyauto02 · May 21st, 2007, 11:46 PM

I know that the primaries are 1 5/8, but what I am looking for is the size that will attach to the H-pipe I am going to have built. I need to order my cats but am not sure if I should go with 2.25" or 2.5" inlet/outlet.

Also, for anyone who has had a H-pipe made what size did you go with, the 2.25 or 2.5? Just curious.

Thanks for the help (and I did search just to let you guys know.

)

Onemanzu · May 21st, 2007, 11:47 PM

doesn't it say on macs website im pretty sure its 1 and 5/8 inch but don't hold me to it

greyauto02 · May 22nd, 2007, 12:00 AM

That is right!!!! I had it all mixed up in my head. I kept thinking that the primaries were what was coming out of the block!! (that would be some flow uhh!!)

I guess what my question should be is do most people do 2.25 when they have to build a H-pipe, or 2.5. ( I know the Mac offroad one is a 2.5) Just curious.

Thanks.

Onemanzu · May 22nd, 2007, 12:09 AM

depends on your future plans if you are gonna role with a stock engine or full bolt ons go with 2.25 if you plan on super charging 2.5 will do or even 3 if you plan on running huge boost

greyauto02 · May 22nd, 2007, 12:15 AM

Awesome. The 2.25 is what I was planning on using most likely to keep the backpressure. Thank you for your input.

AtlanticBlue99 · May 22nd, 2007, 12:19 AM

it will accomodate 2.25 or 2.5 at the collector. i went with 2.5" off road H pipe.

Onemanzu · May 22nd, 2007, 12:24 AM

AB you still have a n.a set up or you runnin a charger of some sort... i haven't heard from you in months glad to see you

oh and AB your car is beastly so you can run 2.5 and not have to many problems

AtlanticBlue99 · May 22nd, 2007, 12:26 AM

still n/a and will probably stay that way. starting college in a couple months and need to save the money to be living on my own...

2.5 is fine for 200hp applications. you can prepare for more power by running mandrel bent 2.5" stainless pipes...

ByPopularDemand · May 22nd, 2007, 12:31 AM

I went 2.5 o/r H pipe too...it doesn't give me trouble it just picks up the added power later...

greyauto02 · May 22nd, 2007, 01:23 PM

Thanks for all the help and the fast replies.

Are there any tricks I should be aware of for the install? I already ordered o2 extenders because I have read that it just makes it easier than trying to extend the stock ones.

ByPopularDemand · May 22nd, 2007, 01:38 PM

You should be set

Texan_Stud · May 22nd, 2007, 05:43 PM

i went with 2.25 i guess its just w/e you want its not too big a diff alil more bottum or alil more top is the only dif i heard off if you plan on going big tho get the 2.5

MustangMo · May 22nd, 2007, 05:44 PM

does the size make much diff in sound

Texan_Stud · May 22nd, 2007, 05:54 PM

Originally Posted by MustangMo

does the size make much diff in sound

in a way.. because the smaller the pipes the harder it has to force the air through so IMO it sounds better with 2.25s but if you go too small on the piping too it will sound like shiizz

MustangMo · May 22nd, 2007, 06:15 PM

ok

May 21st, 2007, 11:46 PM	#1
greyauto02 Regular Join Date: May 2007 Location: Houston, Texas Posts: 106 iTrader: 0 reviews	Mac Longtube outlet size? Need for H-pipe build I know that the primaries are 1 5/8, but what I am looking for is the size that will attach to the H-pipe I am going to have built. I need to order my cats but am not sure if I should go with 2.25" or 2.5" inlet/outlet. Also, for anyone who has had a H-pipe made what size did you go with, the 2.25 or 2.5? Just curious. Thanks for the help (and I did search just to let you guys know. )

May 21st, 2007, 11:47 PM	#2
Onemanzu ¡ʇsnq ɹo uʍop ǝpısdn Join Date: Oct 2006 Location: Looking for free hand jobs in poland springs nebraska... silly gooses Posts: 12,514 Blog Entries: 1 iTrader: 0 reviews	doesn't it say on macs website im pretty sure its 1 and 5/8 inch but don't hold me to it __________________ My Foz

May 22nd, 2007, 12:00 AM	#3
greyauto02 Regular Join Date: May 2007 Location: Houston, Texas Posts: 106 iTrader: 0 reviews	That is right!!!! I had it all mixed up in my head. I kept thinking that the primaries were what was coming out of the block!! (that would be some flow uhh!!) I guess what my question should be is do most people do 2.25 when they have to build a H-pipe, or 2.5. ( I know the Mac offroad one is a 2.5) Just curious. Thanks. __________________ 2002 Mineral Grey Metallic Mac Catback Black w/Chrome Bullitt Wheels Mac LT headers

May 22nd, 2007, 12:09 AM	#4
Onemanzu ¡ʇsnq ɹo uʍop ǝpısdn Join Date: Oct 2006 Location: Looking for free hand jobs in poland springs nebraska... silly gooses Posts: 12,514 Blog Entries: 1 iTrader: 0 reviews	depends on your future plans if you are gonna role with a stock engine or full bolt ons go with 2.25 if you plan on super charging 2.5 will do or even 3 if you plan on running huge boost __________________ My Foz

May 22nd, 2007, 12:15 AM	#5
greyauto02 Regular Join Date: May 2007 Location: Houston, Texas Posts: 106 iTrader: 0 reviews	Awesome. The 2.25 is what I was planning on using most likely to keep the backpressure. Thank you for your input. __________________ 2002 Mineral Grey Metallic Mac Catback Black w/Chrome Bullitt Wheels Mac LT headers

May 22nd, 2007, 12:19 AM	#6
AtlanticBlue99 I Post Entirely Way Too Much 1999 Ford Mustang V6 14.79 @ 92.15 Join Date: Aug 2005 Location: University of Georgia Posts: 8,859 Blog Entries: 1 iTrader: 0 reviews	it will accomodate 2.25 or 2.5 at the collector. i went with 2.5" off road H pipe. __________________ ModdedAutos 1999 Mustang V6 I used to list my mods here but stopped when I exceeded 255 characters.

May 22nd, 2007, 12:24 AM	#7
Onemanzu ¡ʇsnq ɹo uʍop ǝpısdn Join Date: Oct 2006 Location: Looking for free hand jobs in poland springs nebraska... silly gooses Posts: 12,514 Blog Entries: 1 iTrader: 0 reviews	AB you still have a n.a set up or you runnin a charger of some sort... i haven't heard from you in months glad to see you oh and AB your car is beastly so you can run 2.5 and not have to many problems __________________ My Foz

May 22nd, 2007, 12:26 AM	#8
AtlanticBlue99 I Post Entirely Way Too Much 1999 Ford Mustang V6 14.79 @ 92.15 Join Date: Aug 2005 Location: University of Georgia Posts: 8,859 Blog Entries: 1 iTrader: 0 reviews	still n/a and will probably stay that way. starting college in a couple months and need to save the money to be living on my own... 2.5 is fine for 200hp applications. you can prepare for more power by running mandrel bent 2.5" stainless pipes... __________________ ModdedAutos 1999 Mustang V6 I used to list my mods here but stopped when I exceeded 255 characters.

May 22nd, 2007, 12:31 AM	#9
ByPopularDemand Hardcore Enthusiast 2000 V6 Join Date: Jan 2007 Location: Albuquerque Posts: 2,670 iTrader: 0 reviews	I went 2.5 o/r H pipe too...it doesn't give me trouble it just picks up the added power later... __________________ 2000 V6 vert Mac LT headers, Mac O/R H-pipe, Mac CAI, ASP 25% underdrive pulley(r.i.p), SCT tune, 8.8 rear and 4.10 gears.

May 22nd, 2007, 01:23 PM	#10
greyauto02 Regular Join Date: May 2007 Location: Houston, Texas Posts: 106 iTrader: 0 reviews	Thanks for all the help and the fast replies. Are there any tricks I should be aware of for the install? I already ordered o2 extenders because I have read that it just makes it easier than trying to extend the stock ones. __________________ 2002 Mineral Grey Metallic Mac Catback Black w/Chrome Bullitt Wheels Mac LT headers

May 22nd, 2007, 01:38 PM	#11
ByPopularDemand Hardcore Enthusiast 2000 V6 Join Date: Jan 2007 Location: Albuquerque Posts: 2,670 iTrader: 0 reviews	You should be set __________________ 2000 V6 vert Mac LT headers, Mac O/R H-pipe, Mac CAI, ASP 25% underdrive pulley(r.i.p), SCT tune, 8.8 rear and 4.10 gears.

May 22nd, 2007, 05:43 PM	#12
Texan_Stud Hardcore Enthusiast Join Date: Jan 2007 Location: Saginaw, Texas Posts: 1,381 iTrader: 0 reviews	i went with 2.25 i guess its just w/e you want its not too big a diff alil more bottum or alil more top is the only dif i heard off if you plan on going big tho get the 2.5 __________________ I don't drive fast. I fly slow.

May 22nd, 2007, 05:44 PM	#13
MustangMo Enthusiast 1993 1.8 Acura Integra Ls Slow Join Date: Sep 2006 Location: Madison, VA Posts: 743 iTrader: 0 reviews	does the size make much diff in sound

May 22nd, 2007, 06:15 PM	#15
MustangMo Enthusiast 1993 1.8 Acura Integra Ls Slow Join Date: Sep 2006 Location: Madison, VA Posts: 743 iTrader: 0 reviews	ok

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