DJE624 Downpipe Installation

[glock-coma]

Pretty sure this is the link. Post #5

http://www.ecoboostownerforums.com/forum/ecoboost-taurus-sho-mks-forum/ecoboost-sho-mks-tuning/867-warranty-questions

 

[glock-coma]

Better yet, here are the pics

 

[Needmoreboost]

There is definite "restriction" in the stock mufflers, as Scrming had shown in cutaways on the other site.  Another reason why aftermarket catbacks (or mufflers) help.

Lol.  At just a minor bolt on and tune level the stock mufflers flow more than enough.  The bottle neck is more in that 3rd cat as stated many times before.  Mufflers are for sound on these cars...

 

[68_GT]

wow I dont know that's not exactly a striaght shot out of the tail pipe for exhaust to flow through the stock mufflers ! that being said It's surprising the cat back exhaust doesn't pick up more power removing the stock piping and muffers.

 

[DJE624]

I'll be getting my resonator re-installed Friday.  It's just a bit too loud and raspy. The resonator is full size straight through so I'm not worried about losing any more than one or two horsepower.  I think with the catless down pipes and no third cat, I'll be just fine.

 

[Needmoreboost]

Dave, it will be ok.  LOL

You should have enough firepower to make the 12's now.  I bet your neighbors wondered what happened to your car though. 

 

[DJE624]

Thanks Jeff.  I'm shootin' for a 12.8  Haven't heard from the neighbors but since it's kind of a retirement community (over 50)  I don't think they can even hear me.  :clown:

 

[yowen]

Very interesting to read all this! I'm just slightly behind DJE on my mods.

I'll be sure to post a video once I have catless DP's and stage 4+ installed, I don't doubt I'll want to take that 3rd cat out, haha. I maybe go with a high flow one though, we'll see. Good to know I can be shooting for 12's!

 

[DJE624]

If you leave the third cat in, it will help control gasoline odors.  It doesn't bother me.  But, I do recommend leaving in the resonator in with the stock mufflers. If I was going to do it again, I'd save myself the trouble and cost by just doing the down pipes and leaving the third cat and resonator alone.

 

[Needmoreboost]

If you leave the third cat in, it will help control gasoline odors.  It doesn't bother me.  But, I do recommend leaving in the resonator in with the stock mufflers. If I was going to do it again, I'd save myself the trouble and cost by just doing the down pipes and leaving the third cat and resonator alone.

Yeah, I notice the "smell" more in colder air especially when it's warming up in the garage.  This is like my 5th car I've run catless so I'm used to it.  LOL

 

[68_GT]

do you think there's much / any power gain by removing the 3rd cat ?

I wonder what exhaust set up will give the most power and not be loud ?

my 2000 Mustang made 708 hp at the wheels and had no cats and never smelled like gas. Gas smell makes me nausious I can't have that smell esp in my family cruiser with my 3 girls.....

 

[BiGMaC]

do you think there's much / any power gain by removing the 3rd cat ?
Gas smell makes me nausious I can't have that smell esp in my family cruiser with my 3 girls.....

I hate a raw gas smell on a car too. I have, and many others have commented on the quick sooting of the exhaust tips.  It makes me wonder if the engine runs on the rich side at lower rpms so that maintain fuel at higher rpms or rapid acceleration.

There should be some power, but I'd bet the engine likely should be tuned for this to get max benefit. The turbo technology keeps me thinking.  Only a dyno and data logging pre and post can objectively say what the increase is or if it is significant.

 

[SHOdded]

Thanks Jeff.  I'm shootin' for a 12.8  Haven't heard from the neighbors but since it's kind of a retirement community (over 50)  I don't think they can even hear me.  :clown:

They're probably thinking "Those young 'uns nowadays ..."

 

[DJE624]

Yeah, I notice the "smell" more in colder air especially when it's warming up in the garage.  This is like my 5th car I've run catless so I'm used to it.  LOL

Yeah, I only noticed it when I backed up to the open garage.  It's not that bad.

I hate a raw gas smell on a car too. I have, and many others have commented on the quick sooting of the exhaust tips.  It makes me wonder if the engine runs on the rich side at lower rpms so that maintain fuel at higher rpms or rapid acceleration.

There should be some power, but I'd bet the engine likely should be tuned for this to get max benefit. The turbo technology keeps me thinking.  Only a dyno and data logging pre and post can objectively say what the increase is or if it is significant.

I think you are right.  The tunes run a little rich so they have more fuel up top.

do you think there's much / any power gain by removing the 3rd cat ?

I wonder what exhaust set up will give the most power and not be loud ?

my 2000 Mustang made 708 hp at the wheels and had no cats and never smelled like gas. Gas smell makes me nausious I can't have that smell esp in my family cruiser with my 3 girls.....

If you are using non catted down pipes, you probably won't gain too much more deleting the third cat.  (At least you are not pushing exhaust through two cats.)  I think though that deleting the third cat and leaving the resonator in will net you the most gain and still be audibly palatable. That's my plan.

Thanks Jeff.  I'm shootin' for a 12.8  Haven't heard from the neighbors but since it's kind of a retirement community (over 50)  I don't think they can even hear me.  :clown:

They're probably thinking "Those young 'uns nowadays ..."

Hey, that's me! :clown:

 

[Joleat]

Has anyone just replaced the stock mid-pipe (3rd cat and resonator) and kept the stock downpipes and mufflers? Thoughts? I know stock downpipes aren't the best for flow, but what about the sound?

 

[BiGMaC]

Has anyone just replaced the stock mid-pipe (3rd cat and resonator) and kept the stock downpipes and mufflers? Thoughts? I know stock downpipes aren't the best for flow, but what about the sound?

I don't understand why this alone would be done… Look at the pics of the stock and OEM DPs http://www.ecoboostperformanceforum.com/index.php?topic=2054.msg28591#msg28591

Why would you want to leave the flow restriction coming out of the turbo manifolds, then relieve restriction… might help, but can't overcome the initial restriction or offer what you need for optimal early turbo spooling.
Of course I haven't done this and have no objective or subjective data on how your idea would affect performance … maybe you could get some!  :alkashi:

 

[black99lightning]

When you going to be able to go to the track?  I think a 12.8 is definitely in reach.  I'm gonna wait for a cold day before I go back again. 

 

[Joleat]

BigMac,

I think you may have misunderstood my question. The performance aspect isn't really a concern of mine. I was just wondering how it would sound. I can fabricate an x-pipe for next to nothing and was just wondering if it would be too raspy. My initial thought is that it wouldn't be bad with the stock downpipes and mufflers, but I was hoping someone had already tried it.

 

[BiGMaC]

BigMac,

I think you may have misunderstood my question. The performance aspect isn't really a concern of mine. I was just wondering how it would sound. I can fabricate an x-pipe for next to nothing and was just wondering if it would be too raspy. My initial thought is that it wouldn't be bad with the stock downpipes and mufflers, but I was hoping someone had already tried it.

My bad…. sorry... I get it now. Took a minute  :sorry:  ...  Senior moment I guess!  :homer:
Go for it and see.  I do know DJE thinks it's too raspy with the resonator and third cat removed, but he also did non-catted DPs (see his post)

 

[Joleat]

No worries!

I read the post about sounding raspy with the aftermarket downpipes. I was hoping that wouldn't be the case with stock catted downpipes.

I'll be honest, I'm a sucker for the sound of a gasoline-powered V8. I know I can't make the 3.5EB sound like a V8, but I would definitely like a little more rumble.