X Pipe or H Pipe -351C

[Big Red Mach 1]

What does everyone have on their Clevelands?

Right now I have ceramic coated Hooker long tubes, Then 2.5" straight all the way back to the Flowmasters, then out. So clearly no exhaust scavenging taking place. I know all the newer vehicles run X- Pipes, but I see a decent amount of H-Pipes on the older models. Whatcha Got??

 

[Don C]

Mine had h-pipes on it when I got it, and that is probably what I'll go with when I get it back together. H-pipes supposedly make more torque than x-pipes. Plus h-pipes do have a deeper tone and growl better. X-pipes tend to have a higher pitched, almost staccato, sound

 

[Kilgon]

I have a 460 and am running 3" exhaust with h pipe.  Exhaust sounds great and has a nice tone to it.  As Don mentioned h pipes are suppose to produce a little more torque but less hp over x pipes.  In most cases you will not notice the difference between the two other than the sound produce.

 

[c9zx]

What Don C and Kilgon said. Personal preference on sound. I like the H sound. Chuck

 

[Tnfastbk]

I have an X pipe on mine (351C stroked to 408) and my wife has an H on hers(351W). Hers has a deeper sound than mine for sure. The best analogy I heard was

H= Nascar

X= Indy car

 

[Stanglover]

Mine is an H pipe, but I think that the main thing is the two are joined at some point to balance it all out. When I worked on air induction resonators, a perpendicular  (90 *) connection (H pipe) between the air flow direction and the resonator canister always worked better than one mounted at an angle (X pipe), if that makes any sense to anyone.

 

[Mister 4x4]

What does everyone have on their Clevelands?

Right now I have ceramic coated Hooker long tubes, Then 2.5" straight all the way back to the Flowmasters, then out. So clearly no exhaust scavenging taking place. I know all the newer vehicles run X- Pipes, but I see a decent amount of H-Pipes on the older models. Whatcha Got??

I have pretty much the same set-up, except Pypes Street Pro mufflers that came with the 2.5" stainless exhaust system.  Sounds deep and meaty to me from the driver seat and not 'brappy' at all.

I don't have any Cleveland-powered H-pipe cars around to compare with.


View attachment Frankenstang_20180928[1].mp4

 

[Stanglover]

There is (or was) a video of my car in 'video walk arounds' posted earlier this year. This is with an H pipe and 2.25" Flowmaster FlowFX mufflers.

 

[Big Red Mach 1]

Here's what mine sounds like currently. I love the sound, but exhaust scavenging is what I'm after. My sounds is great I feel, but can't see where the H would hurt it. 

https://youtu.be/B3-S90c7R4Q

 

[Stanglover]

Here's what mine sounds like currently. I love the sound, but exhaust scavenging is what I'm after. My sounds is great I feel, but can't see where the H would hurt it. 

https://youtu.be/B3-S90c7R4Q

Sounds good. Could you have an exhaust shop graft an H pipe in?  Don't see why not. Side note, a buddy of mine has a 2000 lightweight Corvette that has a custom exhaust system he recently put on. I remember him saying that the H pipe needs to be a smaller diameter to the main tubes, so if yours are 2.5", you may only need 2" H section. Apparently there is some science involved here!!

When you drive it, do you get a high level of drone at around 2000 - 2500 rpm? If so, you might have Flowmaster 40's that are about 14" long if I remember. Mine drone so bad, the wife didn't want to be in the car. Now I have the FlowFX, she doesn't mind and even wants to drive it.

 

[Big Red Mach 1]

Hey Geoff, I was certainly hoping to have one graft one in. I don't get a bad drone at all. Interesting observation on the 2" diameter. I'll try to do some research on how large the cross pipe should be in relation to the main pipes. 

 

[Robsweden]

351c and X-pipe, hooker aerochamber mufflers

https://youtu.be/XwLhfhlGfUU

 

[goodnigh]

Got an H-pipe setup from Don of OMS.

Based on the exhaust system for a BOSS 351.

Sounds like this on a 4V quench Cleveland.



mike

 

[knn]

@goodnigh sounds awesome, what are your full exhaust specs?

 

[goodnigh]

Don't know, got the system from Don.

Patterned after the BOSS 351 design H-pipe.

Got the engine from Don as a rebuilt never fired

long block.  It has some "enhancements" beyond

stock Cleveland.

mike

 

[tony-muscle]

I still have the one that came with my car against the wall if someone is interested. This was a 2" setup. I upgraded to 2.5" H-pipe with headers. I believe the H is one size smaller pipe.