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Opinions on exhaust crossover #2534470
08/11/18 03:28 AM
08/11/18 03:28 AM
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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

Re: Opinions on exhaust crossover [Re: MidPenMopar] #2534472
08/11/18 04:10 AM
08/11/18 04:10 AM
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Atlanta, GA
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mgoblue9798 Offline
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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.

Re: Opinions on exhaust crossover [Re: MidPenMopar] #2534482
08/11/18 08:27 AM
08/11/18 08:27 AM
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in a cattle trailer down by th...
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Guitar Jones Online laugh2
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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?


I never learned to count my blessings, I choose instead to live inside my disasters.

The Scamp is sold, now just two old trucks and one new one.
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NP435, D44, D60 and NP205 divorced transfer case. Magnum 5.2 MPI and NV4500 coming soon.
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Re: Opinions on exhaust crossover [Re: Guitar Jones] #2534490
08/11/18 09:12 AM
08/11/18 09:12 AM
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Florida
Locomotion Offline
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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.

Re: Opinions on exhaust crossover [Re: Guitar Jones] #2534529
08/11/18 12:19 PM
08/11/18 12:19 PM
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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

Re: Opinions on exhaust crossover [Re: MidPenMopar] #2534540
08/11/18 12:47 PM
08/11/18 12:47 PM
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furious70 Offline
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Engine masters on motortrendondemand tested, not enough difference in power for the hassle. Sound was a bit different.


70 Sport Fury
68 Charger
69 Coronet
72 RR
Re: Opinions on exhaust crossover [Re: furious70] #2534544
08/11/18 01:03 PM
08/11/18 01:03 PM
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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!

Re: Opinions on exhaust crossover [Re: MidPenMopar] #2534549
08/11/18 01:14 PM
08/11/18 01:14 PM
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Central Florida
larrymopar360 Offline
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I've never been able to notice a sound difference despite the claims, nor any seat of the pants dyno difference.


Facts are stubborn things.
Re: Opinions on exhaust crossover [Re: MidPenMopar] #2534623
08/11/18 04:04 PM
08/11/18 04:04 PM
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Northern NJ
StukaJU87 Offline
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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.


Scott

1969 Super Bee, 383/4 speed


Re: Opinions on exhaust crossover [Re: MidPenMopar] #2534637
08/11/18 04:34 PM
08/11/18 04:34 PM
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CA
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crackedback Offline
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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.

Re: Opinions on exhaust crossover [Re: MidPenMopar] #2534639
08/11/18 04:35 PM
08/11/18 04:35 PM
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Hamtramck, PA
Alaskan_TA Offline
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C'mon Stu.

Side pipes with no crossover.

You know you want to..... wink

Re: Opinions on exhaust crossover [Re: StukaJU87] #2534647
08/11/18 04:50 PM
08/11/18 04:50 PM
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Highland, MI.
Sunroofcuda Offline
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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.


“Bear in mind that brains and learning, like muscle and physical skill, are articles of commerce. They are bought and sold. You can hire them by the year or by the hour. The only thing in the world not for sale is character.” (Antonin Scalia)
Re: Opinions on exhaust crossover [Re: MidPenMopar] #2534653
08/11/18 05:09 PM
08/11/18 05:09 PM
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Supercuda Offline
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A key point is location of the crossover as well.


They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
Re: Opinions on exhaust crossover [Re: Sunroofcuda] #2534696
08/11/18 06:20 PM
08/11/18 06:20 PM
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Northern NJ
StukaJU87 Offline
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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.


Scott

1969 Super Bee, 383/4 speed


Re: Opinions on exhaust crossover [Re: Sunroofcuda] #2534774
08/11/18 09:44 PM
08/11/18 09:44 PM
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[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

P8110009.JPGP8110010.JPG
Re: Opinions on exhaust crossover [Re: MidPenMopar] #2534778
08/11/18 09:50 PM
08/11/18 09:50 PM
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The Netherlands
BigBlockMopar Offline
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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.

Re: Opinions on exhaust crossover [Re: BigBlockMopar] #2535322
08/12/18 09:48 PM
08/12/18 09:48 PM
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Highland, MI.
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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.


“Bear in mind that brains and learning, like muscle and physical skill, are articles of commerce. They are bought and sold. You can hire them by the year or by the hour. The only thing in the world not for sale is character.” (Antonin Scalia)
Re: Opinions on exhaust crossover [Re: Sunroofcuda] #2535398
08/13/18 12:39 AM
08/13/18 12:39 AM
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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.

Last edited by RoadRunnerLuva; 08/13/18 12:40 AM.

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1969 Chrysler 300 Convertible...440 Big Block (SOLD)
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Re: Opinions on exhaust crossover [Re: MidPenMopar] #2535446
08/13/18 02:53 AM
08/13/18 02:53 AM
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Balt. Md
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383man Offline
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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/

Last edited by 383man; 08/13/18 02:58 AM.
Re: Opinions on exhaust crossover [Re: RoadRunnerLuva] #2535477
08/13/18 07:21 AM
08/13/18 07:21 AM
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The Netherlands
BigBlockMopar Offline
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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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