v6 vs. v8 exhaust

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fordstang2k

New Member

Jun 22, 2003

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May 19, 2004

#1

• May 19, 2004

• #1

I have a 2000 v6 mustang and i want to put on dual exhaust. My friend that just got new exhaust for his 2001 v8 gave me his stock catback and stock h-pipe. I was wonder if the H-pipe bolts up to my headers without any gaps, i wasnt sure if there is a difference in size of the fitings.

 

Tylerb59

Banned

Mar 7, 2003

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Arlington, WA

May 19, 2004

#2

• May 19, 2004

• #2

Mid pipe wont fit, you'll have to cut your Y pipe before the flanges and fabricate piping to the GT mufflers.

Thats what I had done to my old six, although there are companies who provide new mid pipes and dual exhaust setups.

 

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fordstang2k

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Jun 22, 2003

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May 19, 2004

#3

• May 19, 2004

• #3

i was wondering what was the difference in the two sizes between the v8 and the v6 exhaust and if there is any type of fitting that i can use to make the midpipe meet my headers.

 

ChrisYellowV6

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Dec 25, 2003

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Pensacola, FL

May 19, 2004

#4

• May 19, 2004

• #4

it would have to be custom welded. there is no such factory modification (that I know of.) I wouldn't even reccomend using his GT midpipe - it is 2.5". some people say that is ok, some people run it, but i've also been told 2.5" is too big and you can loose too much compression in your exhaust, making you loose a lot of ****. 2.25 is what I have, and most v6's run on 2.25. My 2 cents

 

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Sally00V6

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May 15, 2004

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New York

May 19, 2004

#5

• May 19, 2004

• #5

hey dont get me wrong free stuff is always an awesome thing but i would recommend taking iot to a shop and having thme put on an exhaust. thats what i did and i love it. it ends up at 3 in piping and it sounds awesome and i can feel a difference. but you have free stuff so... but try taking it to a shop and having them do the mid section. i think you will be happier in the end

 

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Stang01GT

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Apr 20, 2003

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New Jersey

May 19, 2004

#6

• May 19, 2004

• #6

first off your car is too slow, adding exhaust will only make it sound like something its not, so wut u shud do is either go buy another car or keep on making your car look fast wit decals, lol just ****in wit u nick. The gt stock exhaust is 2.25" thats including the midpipe and catback, if i were u i wouldnt bother wit the gt midpipe why wud u want somethin wit 4 cats on it just save up and buy some kind of good midpipe wit hi flow cats. I'll keep searching online for some good exhausts, in the mean time keep tabs on daniel and go get some more tint tickets on 37, i'll be home from college when my parents get over my bad grades. peace

 

marvinmycat

Founding Member

Feb 13, 2002

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Buffalo, NY

May 20, 2004

#7

• May 20, 2004

• #7

Skip the mid-pipe, and just have a shop weld up the cat-back portion until you can replace the Y-pipe with an H, X, high-flow cats or eliminate them, and headers.

 

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fordstang2k

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Jun 22, 2003

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May 20, 2004

#8

• May 20, 2004

• #8

Alright my friend referred me to a muffler shop so im gonna check it out today but i have one question and that is what sizes are the two exhaust. I think the V6 is 2" and the V8 is 2 1/4" but correct me if im wrong.

 

marvinmycat

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Feb 13, 2002

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Buffalo, NY

May 20, 2004

#9

• May 20, 2004

• #9

I forget. Either crawl under there and measure it, or wait till you get to the shop.

 

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fordstang2k

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Jun 22, 2003

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May 20, 2004

#10

• May 20, 2004

• #10

Just got back from the shop and got a price of almost $400 (thats suppose to be a deal) to have it put in using the Gt h-pipe, GT catback, and welding in 2 flowmasters that i have. Thats a rip off considering i have all the parts hes just charging me for labor, welding, and like 2 hangers to hold up the exhaust.

 

Tylerb59

Banned

Mar 7, 2003

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Arlington, WA

May 20, 2004

#11

• May 20, 2004

• #11

v6 is 2.25'' Don't get anything larger, you'll actually be losing a bit of low end torque because all of the backpressure being lost...Until of course you have a blower or ported heads / cam / intake.

It cost me $100 for the GT mufflers and pipes freshly taken off, and $90 + tax to have the GT exhaust installed on my '99 v6 about a year ago. $400 is insane.

 

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fordstang2k

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Jun 22, 2003

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May 20, 2004

#12

• May 20, 2004

• #12

Did the exhaust bolt right up to the gt h-pipe and what size is the gt h-pipe

 

ChrisYellowV6

New Member

Dec 25, 2003

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Pensacola, FL

May 20, 2004

#13

• May 20, 2004

• #13

the GT Tails bolt onto a v6 H or X pipe, or reverse Y pipe. The GT H pipe will not fit. Plus as they said, why do yo uwant to use one with those old cats on it anyway?

 

marvinmycat

Founding Member

Feb 13, 2002

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Buffalo, NY

May 20, 2004

#14

• May 20, 2004

• #14

Find another shop, that's a rip off!

 

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JimSilva

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Apr 1, 2004

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May 21, 2004

#15

• May 21, 2004

• #15

$400 is plain crazy. They charge $100-$125 to install the GT cat-back exhaust on a V-6 in SoCal (and I sure wouldn't expect it to be cheaper here than other places)

 

ChrisYellowV6

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Dec 25, 2003

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Pensacola, FL

May 21, 2004

#16

• May 21, 2004

• #16

he'll also be charging you for a minor amount of piping. I paid $120 for the guys to MAKE me an X pipe, AND install everything! He even cut off the existing flowtubes (2.5") and replaced them with new 2.25" tubes!

 

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cobra232

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Mar 10, 2004

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May 21, 2004

#17

• May 21, 2004

• #17

ChrisYellowV6 said:

it would have to be custom welded. there is no such factory modification (that I know of.) I wouldn't even reccomend using his GT midpipe - it is 2.5". some people say that is ok, some people run it, but i've also been told 2.5" is too big and you can loose too much compression in your exhaust, making you loose a lot of ****. 2.25 is what I have, and most v6's run on 2.25. My 2 cents

Click to expand...

GT factory exhaust is 2.25" not 2.5" and 2.5 inch is perfectly fine on the 3.8 you won`t loose any power at all you will gain maybe 10rwhp over the factory single exhaust. torque will most likely stay the same but you won`t loose any power going to the 2.5 duals.

i don`t know where people come up with such sillyness as loosing power going from 2.25"-2.5". that`s just plain misinformation. check out the june issue of MM&FF they added power to the 3.8 going from factory to dual 2.5" exhaust about 15rwhp with LT`s and going catless

 

ChrisYellowV6

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Dec 25, 2003

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Pensacola, FL

May 21, 2004

#18

• May 21, 2004

• #18

well every mechanic i've ever talked to has told me that i'd loose backpressure and low end torque if I went to to 2.5" pipe.

 

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cobra232

New Member

Mar 10, 2004

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May 21, 2004

#19

• May 21, 2004

• #19

ChrisYellowV6 said:

well every mechanic i've ever talked to has told me that i'd loose backpressure and low end torque if I went to to 2.5" pipe.

Click to expand...

well this mechanic is saying that loosing torque is baloney by going from 2.25 single or duals to 2.5 duals. you may not gain any torque but you wont loose any either. the better breathing will add HP. the more air in and out the more power you will make.

the factory GT take offs don`t flow very good either but are fine for most lightly modded v6`s. i don`t like the GT exhaust because it limits breathing for furture mods and doesn`t expand very well when trying to fit 2.5" mufflers to the barely 2.25" pipes. they like to split when expanded. the best thing to do when using the GT takeoffs is to use a 2.25" muffler instead of a 2.5".

my 99 GT vert was a real pain in the a$$ to add 2.5 inch flow masters onto. i had to make my own mid pipes because the factory ones split about 6inches up when i tried to expand them. then i had to make adapters for the tailpipes for them to fit. for the price of aftermarket exhaust it is not worth the effort to use the GT takeoffs on the v6.

if you could fit dual 3" exhaust on a v6 it may not add any power over the 2.25 or 2.5 inch but it won`t loose any either. it goes against the laws of physics