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#2534470 - 08/11/18 01:28 AM Opinions on exhaust crossover
MidPenMopar Offline
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Registered: 12/13/03
Posts: 36257
Loc: South San Francisco, Californi...


What is the consensus about having an H-pipe, an X-pipe or just going with straight dual pipes and no crossover at all?

It seems without a crossover tube working on the underside of the drive train would be so much easier.

Any thoughts on this?
Thank you
Stu
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#2534472 - 08/11/18 02:10 AM Re: Opinions on exhaust crossover [Re: MidPenMopar]
mgoblue9798 Offline
enthusiast

Registered: 03/16/10
Posts: 241
Loc: Atlanta, GA
There is nothing wrong with straight dual exhaust, but your are leaving some power on the table and will have a little noisier exhaust without an x or h. X is best if it is workable.

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#2534482 - 08/11/18 06:27 AM Re: Opinions on exhaust crossover [Re: MidPenMopar]
Guitar Jones Offline
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Registered: 12/18/09
Posts: 9943
Loc: in a cattle trailer down by th...
Personally I'm all for making my vehicles easier to work on rather than try to get every last ounce of performance. How much can you really use on a street car anyway?
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#2534490 - 08/11/18 07:12 AM Re: Opinions on exhaust crossover [Re: Guitar Jones]
Locomotion Offline
master

Registered: 01/19/03
Posts: 5535
Loc: Florida
I have a TTI X-pipe in my 3" full exhaust that ends at the rear end housing on my race cars. The "X" ends up at the end of the tailshaft and there is plenty of room to drop the trans pan for service. I had to "ding" the "X" to insure clearance to the driveshaft loop, but it did help performance a bit. The only down-side I can see with the "X" is that I have to drop the exhaust system to change the trans. Gotta watch the straight pipe routing whether you have an "X" or not.

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#2534529 - 08/11/18 10:19 AM Re: Opinions on exhaust crossover [Re: Guitar Jones]
MidPenMopar Offline
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Registered: 12/13/03
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Loc: South San Francisco, Californi...
Originally Posted By Guitar Jones
Personally I'm all for making my vehicles easier to work on rather than try to get every last ounce of performance. How much can you really use on a street car anyway?


That was my thinking too, as i bought some of those chambered mufflers and will be redoing the exhaust system. The 3 inch H-pipe i have now hangs down and scrapes over speed bumps. So i was thinking of just going with straight dual pipes this time. I am going back to 2.5 pipes as well.

Stu
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#2534540 - 08/11/18 10:47 AM Re: Opinions on exhaust crossover [Re: MidPenMopar]
furious70 Offline
pro stock

Registered: 11/30/06
Posts: 1557
Loc: IL
Engine masters on motortrendondemand tested, not enough difference in power for the hassle. Sound was a bit different.

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#2534544 - 08/11/18 11:03 AM Re: Opinions on exhaust crossover [Re: furious70]
MidPenMopar Offline
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Registered: 12/13/03
Posts: 36257
Loc: South San Francisco, Californi...
Originally Posted By furious70
Engine masters on motortrendondemand tested, not enough difference in power for the hassle. Sound was a bit different.


Thank you for the input!
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#2534549 - 08/11/18 11:14 AM Re: Opinions on exhaust crossover [Re: MidPenMopar]
larrymopar360 Offline
top fuel

Registered: 01/07/11
Posts: 1692
Loc: Central Florida
I've never been able to notice a sound difference despite the claims, nor any seat of the pants dyno difference.
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#2534623 - 08/11/18 02:04 PM Re: Opinions on exhaust crossover [Re: MidPenMopar]
StukaJU87 Offline
master

Registered: 02/20/10
Posts: 2548
Loc: Northern NJ
How about running straight duals out the back....no mufflers? I currently have mufflers with no crossover and they sound great, but the drivers side has a loose baffle or something and rattles a bit.

Was thinking about having the muffler shop just replace the mufflers with pipe.
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#2534637 - 08/11/18 02:34 PM Re: Opinions on exhaust crossover [Re: MidPenMopar]
crackedback Offline


Registered: 02/15/15
Posts: 1144
Loc: CA
Every car and combination is different.

Without testing each combo, it's a crapshoot as to whether one has benefits over the others.

Myron has the data and it works on his car.

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#2534639 - 08/11/18 02:35 PM Re: Opinions on exhaust crossover [Re: MidPenMopar]
Alaskan_TA Offline
Fluffy Balladeer

Registered: 01/20/03
Posts: 27252
Loc: Moredoor, PA
C'mon Stu.

Side pipes with no crossover.

You know you want to..... wink

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#2534647 - 08/11/18 02:50 PM Re: Opinions on exhaust crossover [Re: StukaJU87]
Sunroofcuda Offline
master

Registered: 01/20/03
Posts: 6535
Loc: Highland, MI.
Originally Posted By StukaJU87
How about running straight duals out the back....no mufflers? I currently have mufflers with no crossover and they sound great, but the drivers side has a loose baffle or something and rattles a bit.

Was thinking about having the muffler shop just replace the mufflers with pipe.


During exhaust experimentation with Viper development, they straight-piped one & lost about 30 HP & the engine temp increased also about 30 degrees. They let things cool down & installed some mufflers. Everything came back into normal range. For a street car, it's my opinion you need an expansion chamber in the system. Plus, straight pipes don't do ANY tuning for sound, nor do glasspacks. Stu, for what it's worth, on a dual exhaust I prefer an H-pipe vs. an X-pipe. The crossover should be .75 the diameter of the system. On a 2.5" dual, the crossover should be approx. 2" according to the math. Helps to equalize pressure between banks & mellows the sound a little.
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#2534653 - 08/11/18 03:09 PM Re: Opinions on exhaust crossover [Re: MidPenMopar]
Supercuda Offline
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Registered: 09/04/07
Posts: 13835
Loc: up yours
A key point is location of the crossover as well.
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#2534696 - 08/11/18 04:20 PM Re: Opinions on exhaust crossover [Re: Sunroofcuda]
StukaJU87 Offline
master

Registered: 02/20/10
Posts: 2548
Loc: Northern NJ
Originally Posted By Sunroofcuda
Originally Posted By StukaJU87
How about running straight duals out the back....no mufflers? I currently have mufflers with no crossover and they sound great, but the drivers side has a loose baffle or something and rattles a bit.

Was thinking about having the muffler shop just replace the mufflers with pipe.


During exhaust experimentation with Viper development, they straight-piped one & lost about 30 HP & the engine temp increased also about 30 degrees. They let things cool down & installed some mufflers. Everything came back into normal range. For a street car, it's my opinion you need an expansion chamber in the system. Plus, straight pipes don't do ANY tuning for sound, nor do glasspacks. Stu, for what it's worth, on a dual exhaust I prefer an H-pipe vs. an X-pipe. The crossover should be .75 the diameter of the system. On a 2.5" dual, the crossover should be approx. 2" according to the math. Helps to equalize pressure between banks & mellows the sound a little.


Thank you Sunroofcuda, I will just have the muffler replaced.
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1969 Super Bee, 383/4 speed

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#2534774 - 08/11/18 07:44 PM Re: Opinions on exhaust crossover [Re: Sunroofcuda]
MidPenMopar Offline
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Registered: 12/13/03
Posts: 36257
Loc: South San Francisco, Californi...
[quote=Sunroofcuda]. Stu, for what it's worth, on a dual exhaust I prefer an H-pipe vs. an X-pipe. The crossover should be .75 the diameter of the system. On a 2.5" dual, the crossover should be approx. 2" according to the math. Helps to equalize pressure between banks & mellows the sound a little. [quote]

Now i have this 3 inch H-pipe with the glass-packs.

When i get your chambered exhaust i was going to dump the H-pipes and run just straight pipes and the chambered exhaust.

So you are recommending i go back to a smaller size diameter crossover, correct??

Sru


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#2534778 - 08/11/18 07:50 PM Re: Opinions on exhaust crossover [Re: MidPenMopar]
BigBlockMopar Offline
master

Registered: 01/22/03
Posts: 3401
Loc: The Netherlands
An X-pipe will remove the typical 'stereo' exhaust pulses coming from the tubes. It will sound more like a modern V8-car.
The H-pipe retains some of that 'old' V8 muscle car sound better imo.
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#2535322 - 08/12/18 07:48 PM Re: Opinions on exhaust crossover [Re: BigBlockMopar]
Sunroofcuda Offline
master

Registered: 01/20/03
Posts: 6535
Loc: Highland, MI.
Originally Posted By BigBlockMopar
An X-pipe will remove the typical 'stereo' exhaust pulses coming from the tubes. It will sound more like a modern V8-car.
The H-pipe retains some of that 'old' V8 muscle car sound better imo.



Agreed - I just like the way an H-pipe sounds better than an X. Stu, as far as textbook "proper" diameter, 2" would be optimum for the crossover. However, since you already have a crossover, I don't think it would be worth the time & trouble to change that out. Might make no difference at all from a performance standpoint.
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#2535398 - 08/12/18 10:39 PM Re: Opinions on exhaust crossover [Re: Sunroofcuda]
RoadRunnerLuva Offline
master

Registered: 01/31/03
Posts: 2907
Loc: Michigan
Doesn't an "H pipe" or crossover pipe also help give MORE low end torque
to the engine, as opposed to just using dual straight pipe? That is what I was schooled on, back in the day, for (street) cars.


Edited by RoadRunnerLuva (08/12/18 10:40 PM)
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#2535446 - 08/13/18 12:53 AM Re: Opinions on exhaust crossover [Re: MidPenMopar]
383man Offline
Too Many Posts

Registered: 01/19/03
Posts: 26889
Loc: Balt. Md
Don't know if this link will work but if it does you can hear my exh when he goes to the back of my car. I use TTI 2" headers and the TTI full exh system with an X-pipe and Dyno-Max Ultra-Flow mufflers. Ron

https://www.facebook.com/moparmusclemag/videos/10155914655157792/


Edited by 383man (08/13/18 12:58 AM)
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#2535477 - 08/13/18 05:21 AM Re: Opinions on exhaust crossover [Re: RoadRunnerLuva]
BigBlockMopar Offline
master

Registered: 01/22/03
Posts: 3401
Loc: The Netherlands
Originally Posted By RoadRunnerLuva
Doesn't an "H pipe" or crossover pipe also help give MORE low end torque to the engine, as opposed to just using dual straight pipe? That is what I was schooled on, back in the day, for (street) cars.


An H or X was proven to make some extra torque over a straight pipe, but in general not quite worth the hassle by Freiburg/Dulcich/Westec Dyno in an Engine Master video on YouTube. (This was before they put every behind a pay-wall and hardly no-one gets to watch their stuff anymore.)

Found the video on DailyMotion instead:
https://www.dailymotion.com/video/x5s8nr8

In short:

Straight pipe - Torque / Horsepower
366 / 363hp

H-pipe
370 / 361hp

X-pipe
370 / 362hp

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