Infiniti XYZ Pipe with HFC + ART Pipe Combo
Joined: Oct 2011
Posts: 126
Likes: 22
From: Dirty Jerzey
Infiniti XYZ Pipe with HFC + ART Pipe Combo
I've read through quite a few posts. Most members are on board with Motordyne's ART pipe set up simply because they are top notch. The pros highly outshine the cons (the only con in reality is the smell). But I have also seen other members post how the XYZ pipe would also be a great addition to the ART pipe setup. Then I see the XYZ with a HFC. Is the HFC for states that have more restrictive inspection guidelines for exhaust fumes?
What is your take on this? I have read endless positives reviews on the ART pipe and TDX2combo. But I am curious on the ART and XYZ pipe/HFC combo. Is it for those who want to run ART pipes but also wish to maintain a stock exhaust setup while passing inspection?
What is your take on this? I have read endless positives reviews on the ART pipe and TDX2combo. But I am curious on the ART and XYZ pipe/HFC combo. Is it for those who want to run ART pipes but also wish to maintain a stock exhaust setup while passing inspection?
Last edited by Jiggyfingers; Dec 1, 2011 at 02:02 PM.
Joined: Mar 2009
Posts: 18,299
Likes: 1,488
From: By the sea, Tx
G35 sedan w/ too much money in mods
The purpose of the HFC module is indeed to be able to pass emissions when added to the ART/XYZ combo. Doesn't necessarily have to be on a stock exhaust, I have a full MD exhaust on my sedan from the ARTs back. Fortunately we don't have the sniffer here in Texas yet so I have the resonated module on my XYZ.
And the smell issue is waaaaay overblown IMHO. It's really not that noticeable, especially with your windows up. And if you're an old school muscle car guy like me, you might actually enjoy it, I do. Takes me back to the good old days.............
And the smell issue is waaaaay overblown IMHO. It's really not that noticeable, especially with your windows up. And if you're an old school muscle car guy like me, you might actually enjoy it, I do. Takes me back to the good old days.............
Joined: Oct 2011
Posts: 126
Likes: 22
From: Dirty Jerzey
The purpose of the HFC module is indeed to be able to pass emissions when added to the ART/XYZ combo. Doesn't necessarily have to be on a stock exhaust, I have a full MD exhaust on my sedan from the ARTs back. Fortunately we don't have the sniffer here in Texas yet so I have the resonated module on my XYZ.
And the smell issue is waaaaay overblown IMHO. It's really not that noticeable, especially with your windows up. And if you're an old school muscle car guy like me, you might actually enjoy it, I do. Takes me back to the good old days.............
And the smell issue is waaaaay overblown IMHO. It's really not that noticeable, especially with your windows up. And if you're an old school muscle car guy like me, you might actually enjoy it, I do. Takes me back to the good old days.............
Ok thanks. What wheels are those? I like the look of your G.
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From: San Antonio/The Woodlands, Texas
The ART pipes helmholtz resonator alone has more R&D than most companies put into a whole exhaust. As a result, they don't rasp. I've had mine for quite some time and they are utter perfection.
Joined: Oct 2011
Posts: 126
Likes: 22
From: Dirty Jerzey
Please do tell the before and after experience after installing them....
Joined: Mar 2009
Posts: 18,299
Likes: 1,488
From: By the sea, Tx
G35 sedan w/ too much money in mods
All you could ever want to know, posted in the ART thread 
Damn I posted the update with pics while I was at UpRev this afternoon, don't know where it went? 
Any hoo, here's the skinny. I'm happy to report that fitment is not an issue with the V2.1s. I had about an inch of clearance between the resonators and the AT pan. And the cat brace Peter mentioned fit like a glove, not sure what the issue was with his car. Here are some pics from beginning to end of install. I'm too tired to edit them so the quality's not great but you'll get the idea.
Stock cats out, driver's side ART going in
Show more
Driver side installed-note it even clears the small clip for the O2 sensor wire
Show more
Closer pic of driver's side
Show more
Passenger side going in
Show more
Passenger side being tightened down
Show more
Passenger side in
Show more
All bolted up to the XYZ
Show more
Cat bracket about to be bolted up to the ARTs
Show more
And now the results, I'm a little disappointed but I had Omar re-tune the car, he's very experienced and I trust him completely. I ended up with only a 5 HP/TQ gain at peak but around 10/10 throughout the 2-5K rpm range. So final peak numbers are 257/237. Omar worked on the tune for over 2 hours and ended up having to play with the cam phasing which is where I finally got over the initial loss. First 3 pulls showed a loss of 5/5 which I was really surprised at. Jared, the lead tuner at UpRev, also tweaked it a little and I called Church's in SoCal to seek their advice. There are no leaks in the system so it is what it is. Overall full bolt on MD from the headers back gave me a 15/12 gain over what it had been with stock cats and my Frankenstein'd stock exhaust so I'm happy with that. The tone of the exhaust got noticeably deeper, it's starting to not sound like a V6 but still has the sweet VQ warble. And the overall volume got significantly louder, car sounds plain mean when I get on it. But, when I'm cruising at 60 with no load on the motor it's completely silent.
So overall I'm really happy with the end result, just surprised that removing the stock cats didn't free up more power. The car is definitely faster from 1500 RPMs up, but I didn't get back the low end grunt I lost with the 3" exhaust piping. The sound is magic when driving with the windows down, I've had a big grin all evening. The exhaust smell isn't any more prevalant than it was with the exhaust installed, and me being an old school muscle car guy, I actually like the smell.
I'm uploading a vid of one pull on the dyno and will add it to this post when it's finished. I need to get one off the dyno, the roller made a lot of noise. So if you're contemplating this mod, it definitely gets the Blue Dream seal of approval, it's well worth the money!!
Video
Any hoo, here's the skinny. I'm happy to report that fitment is not an issue with the V2.1s. I had about an inch of clearance between the resonators and the AT pan. And the cat brace Peter mentioned fit like a glove, not sure what the issue was with his car. Here are some pics from beginning to end of install. I'm too tired to edit them so the quality's not great but you'll get the idea.
Stock cats out, driver's side ART going in
Show moreDriver side installed-note it even clears the small clip for the O2 sensor wire
Show moreCloser pic of driver's side
Show morePassenger side going in
Show morePassenger side being tightened down
Show morePassenger side in
Show moreAll bolted up to the XYZ
Show moreCat bracket about to be bolted up to the ARTs
Show moreAnd now the results, I'm a little disappointed but I had Omar re-tune the car, he's very experienced and I trust him completely. I ended up with only a 5 HP/TQ gain at peak but around 10/10 throughout the 2-5K rpm range. So final peak numbers are 257/237. Omar worked on the tune for over 2 hours and ended up having to play with the cam phasing which is where I finally got over the initial loss. First 3 pulls showed a loss of 5/5 which I was really surprised at. Jared, the lead tuner at UpRev, also tweaked it a little and I called Church's in SoCal to seek their advice. There are no leaks in the system so it is what it is. Overall full bolt on MD from the headers back gave me a 15/12 gain over what it had been with stock cats and my Frankenstein'd stock exhaust so I'm happy with that. The tone of the exhaust got noticeably deeper, it's starting to not sound like a V6 but still has the sweet VQ warble. And the overall volume got significantly louder, car sounds plain mean when I get on it.
But, when I'm cruising at 60 with no load on the motor it's completely silent. So overall I'm really happy with the end result, just surprised that removing the stock cats didn't free up more power. The car is definitely faster from 1500 RPMs up, but I didn't get back the low end grunt I lost with the 3" exhaust piping. The sound is magic when driving with the windows down, I've had a big grin all evening. The exhaust smell isn't any more prevalant than it was with the exhaust installed, and me being an old school muscle car guy, I actually like the smell.
I'm uploading a vid of one pull on the dyno and will add it to this post when it's finished. I need to get one off the dyno, the roller made a lot of noise. So if you're contemplating this mod, it definitely gets the Blue Dream seal of approval, it's well worth the money!!
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