Dual Exhaust Question

[Entryteam]

In a dual exhaust set up... what is the purpose of the "x pipe"?  What does it do?

[Grumpy Bear]

Allows both banks to use both mufflers. Lowers overall back pressure.

Most useful near red line at WOT.

There is an acoustic component as well.   

[kstruckcountry]

It makes it almost as good as a single exhaust. ;)

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[KARNUT]

I come from both worlds. Back when 21/4inch duals was a big upgrade from stock. I prefer twin exhaust no cross over for sound. Nothing beats the sound and rumble of unequal exhaust. Not many people have experience twin 2 1/4 glass pack exhaust. The rumble is unequaled at cruising speed.

 

 

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[garagerog]

In a nutshell, an X-pipe or H-pipe evens out the exhaust pulses from the respective cylinder banks, lowers the back pressure a little, but the main benefit is acoustic as Grumpy alluded to, it will eliminate the annoying pulsating drone at highway speeds in a true dual setup and no need for separate resonators.

[BCMoto]

It helps with performance

[Grumpy Bear]

40 minutes ago, garagerog said:

In a nutshell, an X-pipe or H-pipe evens out the exhaust pulses from the respective cylinder banks, lowers the back pressure a little, but the main benefit is acoustic as Grumpy alluded to, it will eliminate the annoying pulsating drone at highway speeds in a true dual setup and no need for separate resonators.

Personally I LOVED that pulsating drone. Two banks talking to each other. Motor on song. Dad, when I was very young, installed Thrush duels on a 239 flatty. Music to my ears.   

[garagerog]

3 hours ago, KARNUT said:

I come from both worlds. Back when 21/4inch duals was a big upgrade from stock. I prefer twin exhaust no cross over for sound. Nothing beats the sound and rumble of unequal exhaust. Not many people have experience twin 2 1/4 glass pack exhaust. The rumble is unequaled at cruising speed.

 

 

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2 hours ago, Grumpy Bear said:

Personally I LOVED that pulsating drone. Two banks talking to each other. Motor on song. Dad, when I was very young, installed Thrush duels on a 239 flatty. Music to my ears.   

Ok for short trips or for cruising the blvd. but for long trips, not so much.  I used to have glass packs with no equalizing pipe on my 71 Chevelle SS, sounded great at lower speeds, especially  when de-accelerating in 2nd or 3rd with the M20 4 speed. But it got old in short order. I ended up with a dual setup with an inverted H-pipe and Walker Dyno-Max turbo mufflers, still has a little drone @ 2000 rpm but it goes away at freeway speeds. In 2005 I drove this Chevelle cross-country from Wenatchee, Wa. to the low country of SC where I now reside. 80 mph on I-80 for hours on end and I was turning 3500 rpm with the 3.31 geared 12 bolt. The rusty cast iron manifolds even blued for awhile. But it was whisper quiet in the cabin, I'm sure a drive-by recording may have been different. Pretty certain I would have lost my frigging mind if I would have had to listen to a pulsating drone for 40+hours on that cross-country trip.

[Entryteam]

Thank you for all the replies!!!

 

I appreciate them!

[KARNUT]

Ok for short trips or for cruising the blvd. but for long trips, not so much.  I used to have glass packs with no equalizing pipe on my 71 Chevelle SS, sounded great at lower speeds, especially  when de-accelerating in 2nd or 3rd with the M20 4 speed. But it got old in short order. I ended up with a dual setup with an inverted H-pipe and Walker Dyno-Max turbo mufflers, still has a little drone @ 2000 rpm but it goes away at freeway speeds. In 2005 I drove this Chevelle cross-country from Wenatchee, Wa. to the low country of SC where I now reside. 80 mph on I-80 for hours on end and I was turning 3500 rpm with the 3.31 geared 12 bolt. The rusty cast iron manifolds even blued for awhile. But it was whisper quiet in the cabin, I'm sure a drive-by recording may have been different. Pretty certain I would have lost my frigging mind if I would have had to listen to a pulsating drone for 40+hours on that cross-country trip.

I had them on dozens cars and trucks some diesels of various HP with and without headers. All from the same exhaust guy I used for 40 years. Yes the X or cross over scavenges the exhaust better and adds HP. I had that done to scores of vehicles too. It also drones because it equalized. Non equal exhaust rumbles loud or not depending on mufflers. I used them all. Glass packs, thrush, hush thrush, one chambered etc.Even mufflers with removable disks. Even used flange exhaust that exist before the back tires running with a y off full exhaust unmuffled for the drag strip. I know it probably a matter of taste. I like unequal better. I bet most people haven’t heard it. Scavenging the exhaust is the rage now. Large single exhaust does the same on all but very high HP as far as flow.

 

 

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