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Old 04-11-2012, 05:18 PM   #1
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exhaust

I am looking to up grade my stock exhaust on my v6 04 3.9L mustang. I'm pretty new to this so any help whats so ever is good. I have a couple questions

1. should I replace everything from the headers n back?

2. is it better to have a dual exhaust or single for my car?

3.where can I get a new rear bumper with the pipe cut out?
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Old 04-11-2012, 06:17 PM   #2
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well i say go for duals. looks and sounds better. and u can find the rear gt bumper with the cutouts on craigslist or on americanmuscle or latemodelrestoration . and u can work on ur headers later. get two mufflers( flowmaster 40's is what i got) buy some chrome tips and take it to an exhaust shop and have em make u a custom h pipe or just buy an off road h or x pipe.
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Old 04-11-2012, 07:12 PM   #3
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nice! how much noise do you hear inside your car?
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Old 04-11-2012, 07:16 PM   #4
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Horseplay: did they fab a H-pipe out of ur current y-pipe? Because that is genius. And is the piping size 2.25?

---------- Post added at 07:16 PM ---------- Previous post was at 07:15 PM ----------

I'd also love to hear the sound of it cuz I also want flow 40s with an H-pipe
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Old 04-11-2012, 07:19 PM   #5
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its not really loud i kept my cats . has a good deep tone in low rpm's. i like it

---------- Post added at 07:19 PM ---------- Previous post was at 07:16 PM ----------

Quote:
Originally Posted by xhgwx
Horseplay: did they fab a H-pipe out of ur current y-pipe? Because that is genius. And is the piping size 2.25?

---------- Post added at 07:16 PM ---------- Previous post was at 07:15 PM ----------

I'd also love to hear the sound of it cuz I also want flow 40s with an H-pipe
yeah they just turned my y pipe into an h. i needa try to make a youtube or something to record it. if ur looking for a loud sound just remove the cats. i kept mine for now till i afford a Mac o/r h pipe
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Old 04-11-2012, 07:22 PM   #6
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I'm wanting a deep tone throughout the RPM band. But I also want it to turn some heads if I rev up or fly by someone.
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Old 04-11-2012, 07:24 PM   #7
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well removing cats should do the trick.
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Old 04-11-2012, 08:00 PM   #8
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No it wont! I just removed mine, sounds mean as hell until you get to about 3k then its just a big bowl of poop. It is loud though....

---------- Post added at 09:00 PM ---------- Previous post was at 08:59 PM ----------

Actually it starts sounding pretty crappy after 2500.

I've got a catless h pipe with flow 40's dumped before the rear axle.
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Old 04-11-2012, 08:28 PM   #9
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will adding a CAI change the sound at all?
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Old 04-11-2012, 08:49 PM   #10
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Most people say it does, I noticed no difference when I installed mine.
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Old 04-11-2012, 08:51 PM   #11
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I'm going dual as well with h pipes but magnaflows
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Old 04-11-2012, 09:10 PM   #12
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Changes the ENGINE note not the EXHAUST note.
Have u ever heard of people putting 4 mufflers on a car?
I read up on someone who did it, they had like glass packs then flows right after????
I'm
Wondering what that would do if anything? Interesting.....

LTs should change the exhaust note. I'm doing an H-Pipe with Cats. And pacesetters LTs. Flow 40s. I hope it sounds good!
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Old 04-11-2012, 09:15 PM   #13
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Quote:
Originally Posted by osonasty
I am looking to up grade my stock exhaust on my v6 04 3.9L mustang. I'm pretty new to this so any help whats so ever is good. I have a couple questions

1. should I replace everything from the headers n back?

2. is it better to have a dual exhaust or single for my car?

3.where can I get a new rear bumper with the pipe cut out?
U have a 3.8 bro. Not a 3.9. Sorry to be a pain but i had too
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Old 04-11-2012, 09:21 PM   #14
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99-03 are 3.8 @ 190hp and 04 is 3.9 @ 193hp
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Old 04-11-2012, 09:46 PM   #15
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Quote:
Originally Posted by Project Pony
99-03 are 3.8 @ 190hp and 04 is 3.9 @ 193hp
I was told that my 99 came in at 145hp. I found it hard to believe. Now I don't know WHAT to believe, lol.
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Old 04-11-2012, 09:51 PM   #16
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190 at the crank 145 about at the rear wheels...sucks our drivetrains eat up almost 50 horses lol
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Old 04-11-2012, 09:52 PM   #17
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Quote:
Originally Posted by iwalkaline58

U have a 3.8 bro. Not a 3.9. Sorry to be a pain but i had too
didnt the 04 v6 come with a 3.9L engine ???
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Old 04-11-2012, 09:54 PM   #18
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Quote:
Originally Posted by Hutchstang

I was told that my 99 came in at 145hp. I found it hard to believe. Now I don't know WHAT to believe, lol.
Bro we run 193hp lol 140! No offense but we would be hella underpowered at that spec!
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Old 04-11-2012, 09:57 PM   #19
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Yes it is technically a 3.9 but the .1 liter really doesn't make that much of a difference

---------- Post added at 10:56 PM ---------- Previous post was at 10:55 PM ----------

If I'm not mistaken 99-04 v6s completely stock are about 145-150hp at the rear wheels

---------- Post added at 10:57 PM ---------- Previous post was at 10:56 PM ----------

Just because your engine puts out 190 horses doesn't mean that's how much your putting to the ground. Only way to find out is a dyno run
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Old 04-11-2012, 10:43 PM   #20
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I'd say it getting more than 140rwhp I'd bet 150-160 actually because with full bolt ons and a tune you can see as much as 210rwhp I've even heard some up in 230rwhp.

With ported lower/upper
Stage 3 heads
And a cam
You look at 250-260rwhp(without any bolt ons)

All the mustangs are capable of big power v6, v8 even the little four banger in the foxes can make some power, all depends on the build, time and money.

---------- Post added at 10:43 PM ---------- Previous post was at 10:40 PM ----------

A good estimate for our cars in about 20% is lost.
So take 190•.20 and you end up with like 38.
Take 190-38=152rwhp.
That's just a standard on most mustangs.
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Old 04-11-2012, 10:53 PM   #21
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+1 ( i knew it was around there)
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Old 04-11-2012, 10:56 PM   #22
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That's why you hear that UDPs are great, frees up some more horses making the % less. Also an aluminum driveshaft should free some ponies up. Probably drop 5% with the driveshaft and UDPs but that's an estimate, I have no numbers to back that up.
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Old 04-11-2012, 11:32 PM   #23
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Quote:
Originally Posted by Dgerow12
Yes it is technically a 3.9 but the .1 liter really doesn't make that much of a difference

---------- Post added at 10:56 PM ---------- Previous post was at 10:55 PM ----------

If I'm not mistaken 99-04 v6s completely stock are about 145-150hp at the rear wheels

---------- Post added at 10:57 PM ---------- Previous post was at 10:56 PM ----------

Just because your engine puts out 190 horses doesn't mean that's how much your putting to the ground. Only way to find out is a dyno run
I wouldnt say that. Aren't the new v6's 3.7's? I'm not real sure. If so that's smaller than us but producing around 110 more horses. The 3.9 in the 04 version were not suppose to give any extra horses I've heard. 99-04 all had the same stats
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Old 04-12-2012, 12:08 AM   #24
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The new v6 engines are dohc with variable camshaft timing while our v6s are ohv. You can't compare apples to oranges they are 2 completely different engine designs
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Old 04-12-2012, 03:01 AM   #25
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Quote:
Originally Posted by Dgerow12
The new v6 engines are dohc with variable camshaft timing while our v6s are ohv. You can't compare apples to oranges they are 2 completely different engine designs
You know what I mean tho. Lol
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Old 04-12-2012, 04:16 AM   #26
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what combination would give me that perfect rumble from low to high rpms. not too throaty
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Old 04-12-2012, 06:43 AM   #27
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You cant use engine sizes to compare power anymore now its all about efficiency. Did they really make it a 3.9 in 04????
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Old 04-12-2012, 07:22 AM   #28
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Quote:
Originally Posted by iwalkaline58
You cant use engine sizes to compare power anymore now its all about efficiency. Did they really make it a 3.9 in 04????
Yes they did. Also AM dyno'd a 2000 auto and stock numbers were 157rwhp and 189 ft

---------- Post added at 08:22 AM ---------- Previous post was at 08:19 AM ----------

Quote:
Originally Posted by osonasty
what combination would give me that perfect rumble from low to high rpms. not too throaty
Longtubes, cam, h pipe with cats, and dual flow 40's or 10's
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Old 04-12-2012, 08:45 AM   #29
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Quote:
Originally Posted by osonasty
what combination would give me that perfect rumble from low to high rpms. not too throaty
A cam will give any sixxer a good sound probably the closest you'll ever get to the sound of an 8.
Long tubes, H-pipe, 40's are nice and deep, but with a cam SLP loudmouths could sound good.
I'll be doing pacesetters LT, H-pipe, and 40 flows, I'll post a vid in a month of how they sound
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Old 04-12-2012, 12:03 PM   #30
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around how much am I looking to spend
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Old 04-12-2012, 02:12 PM   #31
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Quote:
Originally Posted by xhgwx

A cam will give any sixxer a good sound probably the closest you'll ever get to the sound of an 8.
Long tubes, H-pipe, 40's are nice and deep, but with a cam SLP loudmouths could sound good.
I'll be doing pacesetters LT, H-pipe, and 40 flows, I'll post a vid in a month of how they sound
If you worried about the bad sound after you take them off. Remove them and replace them with aftermarket cats will help ALOT and then go from there. If you dont want it to sound raspy at high rpms keep the cats or replace them. I ran without cats for about 3 days and bought aftermarket because it sounded horrible.

Not to shoot your hopes down but if you want that v8 sound coming from your exhaust trade your v6 in for a v8 and go from there.
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Old 04-12-2012, 03:05 PM   #32
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Re: exhaust

I essentially did the extra muffler to the car thing. The ProChamber could be used as a muffler if left alone. I did long tubes, hi-flow cats, ProChamber, & Flowmaster 10's.
My car is a singleport, starting with 125 HP at the crank. Underdrive pulleys, CAI, and a catback, all together and dyno tuned got me 22HP increase. Torque was high to begin with at 219 fpt. Simple bolt-ons and a set of high ratio gears is what gets the car moving quickly. I have done a ton of work on mine and I'm getting a set of new tunes in a week. The HP numbers are something to see but the way the car performs under each dyno tune file is what's so great.

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---------- Post added at 04:05 PM ---------- Previous post was at 04:01 PM ----------

The ProChamber effect if interested,... I love it.
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Old 04-12-2012, 06:33 PM   #33
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Re: exhaust

i installed pacesetter LT's and just ordered a catback off of Sumitt racing. I don't have money for a midpipe so i bought exhaust piping and that's what i'll be running at the moment for a midpipe.
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Old 04-16-2012, 10:45 PM   #34
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About to get to work on my new exhaust.


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Old 04-16-2012, 10:47 PM   #35
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Re: exhaust



I've got one hell of an exhaust leak lol
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