06-17-2019, 08:14 PM | #1 |
Drives: 2014 1SS/RS, LS3, NPP Join Date: Feb 2019
Location: Florida
Posts: 184
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Benefits of X pipe versus H pipe?
So I keep reading about some guys changing out the H pipe to an X pipe and others not doing so. I looked under my car (NPP) and it seems pretty clear that I have an H looking pipe after the cats. The crossover part is pretty small but it doesn’t appear to cause a restriction....the air just flows past the connector part and out the back.
So I’m wondering, why change it? Is it because of the firing order and exhaust pulses getting jammed up or something? Better sound? I think my factory pipes are 2.5” so maybe when guys increase to 3” it’s just better cross flow to put in a 3” X pipe as well? Thanks in advance for the ongoing learning. |
06-17-2019, 10:03 PM | #2 |
SoCal Camaro5 Race Team
Drives: 2021 Shadow Grey Camaro 2SS 1LE Join Date: Mar 2010
Location: SO CAL
Posts: 14,288
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H pipe for old v8 sound and more low end tq. X pipe for more exotic sound, and higher reving and a bit more power, maybe. Don’t do a 3” x pipe with a 2.5” exhaust.
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06-17-2019, 11:24 PM | #3 |
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Drives: 2011 2SS/ RS INFERNO ORANGE L99 Join Date: Dec 2012
Location: Alliston Ontario Canada
Posts: 9,057
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There is zero performance gains switching from one to the other. As mentioned the x pipe gives you a higher tone while the h pipe is slightly deeper.
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06-18-2019, 07:34 AM | #4 |
Drives: 13 IOM 2ss RS manual Join Date: Jun 2018
Location: Euless,TX
Posts: 213
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when guys increase to 3” it’s just better cross flow to put in a 3” X pipe as well
This is the main reason I went to the X pipe, connected to factory NPP mufflers. Love the sound.
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06-18-2019, 07:44 AM | #5 |
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LOL both of my cars utilize the stock 2.5" NPP and made more power then anyone else's bolt on set up. My current set up on the C6 is the same 3" all the way to the stock axle back and makes 562 at the wheels NA SBE LS3. Not sure why you would direct a guy not to use a 3" X pipe? Please show me how much power he has left on the table. I dropped my whole muffler system on the C6 for last dyno and made zero change when it was still bolt ons......
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2010 C6 JET STREAM BLUE
BOLT ONS TO THE EXTREME, GPI 281cc HEADS, Darth_V8r SPEC CAM, FAST 102 INTAKE, CRANK SCRAPER, QUARTER MASTER 7.25" CLUTCH, RPM 3.90 STAGE II DIF, Z51 Gear Set AND E85 Best ET 10.58 @ 131.8 stock heads and stock cam 453/445 SAE 10.62@134.82 GPI 281CC Heads, SS4 Cam and X1 Intake Best 1/8 6.80@105.75 Best MPH 134.82 |
06-18-2019, 08:10 AM | #6 |
Drives: 2010 Inferno Orange 2SS/RS Join Date: Apr 2010
Location: Clermont, IN
Posts: 3,297
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Gimmick....stick with you H.
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06-18-2019, 11:01 AM | #7 | |
SoCal Camaro5 Race Team
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Quote:
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06-18-2019, 11:31 AM | #8 |
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[QUOTE=VR Baron;10547552]Oops. Miss read your post. Thought you wanted to use a 3” x with a 2.5” catback[/QUOTE
They both used 3" to 2.5" and my C6 still utilizes this set up
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2010 C6 JET STREAM BLUE
BOLT ONS TO THE EXTREME, GPI 281cc HEADS, Darth_V8r SPEC CAM, FAST 102 INTAKE, CRANK SCRAPER, QUARTER MASTER 7.25" CLUTCH, RPM 3.90 STAGE II DIF, Z51 Gear Set AND E85 Best ET 10.58 @ 131.8 stock heads and stock cam 453/445 SAE 10.62@134.82 GPI 281CC Heads, SS4 Cam and X1 Intake Best 1/8 6.80@105.75 Best MPH 134.82 |
06-18-2019, 11:59 AM | #9 |
SoCal Camaro5 Race Team
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[QUOTE=lazerlemonta;10547598]Ok. Didn’t know gm would use 3” pipes and x pipe and neck down to 2.5 st the mufflers? Don’t see the point of that. But method in the madness as they say
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06-18-2019, 12:04 PM | #10 |
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[QUOTE=VR Baron;10547620]Miss understanding. GM uses 2.5" full exhaust. Your header collector is 3" so use 3" all the way back to the axle and reduce to the stock 2.5"
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2010 C6 JET STREAM BLUE
BOLT ONS TO THE EXTREME, GPI 281cc HEADS, Darth_V8r SPEC CAM, FAST 102 INTAKE, CRANK SCRAPER, QUARTER MASTER 7.25" CLUTCH, RPM 3.90 STAGE II DIF, Z51 Gear Set AND E85 Best ET 10.58 @ 131.8 stock heads and stock cam 453/445 SAE 10.62@134.82 GPI 281CC Heads, SS4 Cam and X1 Intake Best 1/8 6.80@105.75 Best MPH 134.82 |
06-18-2019, 12:40 PM | #11 |
Instagram: Sangstah
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X pipe gave mine a slightly higher pitch sound, I like it
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06-18-2019, 12:44 PM | #12 |
SoCal Camaro5 Race Team
Drives: 2021 Shadow Grey Camaro 2SS 1LE Join Date: Mar 2010
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[QUOTE=lazerlemonta;10547625]Ah. Looks like at your power level 3” might help. At my 439 hp level mine didn’t do squat but made a deeper tone, and got a great deal on it. Necking down to 2.5” can’t see how it helps to have 3” in rest if system, peer wise. I see you’re point to fit headers. But plenty of 2.5 “ catbacks to fit to headers. But if it works, cool!
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06-18-2019, 12:52 PM | #13 |
Drives: 2010 2SS/RS Join Date: Dec 2009
Location: Clarksville Tennesse.
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I installed a full Z28 NPP on mine with a X Pipe from a C7 Corvette, if you PM me your cell number I'll send you a sounds clip from NCM. Also have long tubes and HF Cats
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06-18-2019, 01:30 PM | #14 | |
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[QUOTE=VR Baron;10547680]
Quote:
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2010 C6 JET STREAM BLUE
BOLT ONS TO THE EXTREME, GPI 281cc HEADS, Darth_V8r SPEC CAM, FAST 102 INTAKE, CRANK SCRAPER, QUARTER MASTER 7.25" CLUTCH, RPM 3.90 STAGE II DIF, Z51 Gear Set AND E85 Best ET 10.58 @ 131.8 stock heads and stock cam 453/445 SAE 10.62@134.82 GPI 281CC Heads, SS4 Cam and X1 Intake Best 1/8 6.80@105.75 Best MPH 134.82 |
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