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Need advice on VE SS exhaust fix

monstar

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What modifications makes 390 rwkw?
If that result is authentic then it is likely the engine is tuned for top end, can’t have both without some deep thought and derp expertise. Else no thought, no expertise and plumb up a supercharger?
 

TANK 2.0

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What modifications makes 390 rwkw?
If that result is authentic then it is likely the engine is tuned for top end, can’t have both without some deep thought and derp expertise. Else no thought, no expertise and plumb up a supercharger?
The previous owner did all the mods...

Stage 5 cam
HSV headers
Twin 3 inch x force exhaust
500hp+ roller rockers
Stallie
OTR CAI
Diff ratios
Engine and gearbox tuned

All the work was done by Walkinshaw with reciepts
 

monstar

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I don’t get it, what is a stage five cam? Where is it from / what spec?
EDIT: Nevermind, I see the power is at the flywheel makes sense.
Yeah as above an H-pipe up front and that’s the only crossover (true dual) would sound old school. You likely don’t need a muffler except on each side at the rear.
 
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harrop.senator

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Id throw some hotdogs in the middle to kill the rasp and give it that older flatter early to mid rpm purr.
 

Not_An_Abba_Fan

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X Force is one issue, never heard a good one.

vr304 beat me to it, long tube 1 7/8" 4-1 headers will increase you peak without affecting torque too much and will make it sound a lot better.

You can spend the money on the X Force to get it right, by that I mean you get rid of the X merge up front and fit a H. Long hotdogs in the middle and larger can rear mufflers. Or you can spend about the same on a decent cat back, but if you go down the 4-1 header road and need cats anyway, I do the full bolt on system of 1 7/8's, high flow cats an Manta 3" for $2950 shipped. About half a day to bolt it all on and you will not only see an increase in peak, you will also get a much better sound.
 

MYVESSV8

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hey NAAF what effect will it have changing to an H layout on the exhaust instead of X merge, was thinking about putting a thread up about the merge/x pipe/h pipe what effect it would have on flow/sound etc
 

Not_An_Abba_Fan

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hey NAAF what effect will it have changing to an H layout on the exhaust instead of X merge, was thinking about putting a thread up about the merge/x pipe/h pipe what effect it would have on flow/sound etc
H-Pipe: Uses the Hemholtz resonator theory. The H pipe's ratio to the exhaust pipe will cancel out a particular frequency, when done properly it will reduce and in some cases, eliminate drone. The sound from an exhaust is more refined using the H pipe as you have each banks' pulses travelling for the most part independently from each other. On a V8, this gives you 4 pulses in each side. Sounds good.

X-Pipe: There are variations of the X pipe that aren't true X pipes, there are kiss pipes and merge pipes that look like an X but aren't. A true X pipe will be a definite X that does not change pipe size throughout the whole X. Magna Flow make one. A Kiss pipe is basically two bends that touch with hole cut out where they meet. This is a "cheat" version of the H, better than a merge but not really effective in tuning out frequencies. It will have a small effect. The other type is a merge, these are bad for flow as they are similar to a kiss but have a much larger contact area, this reduces the diameter of the exhaust where they meet. Very restrictive. Now the true X is the best of all 3 as it does not reduce in diameter. The effectiveness of an X depends entirely on where you put it, the theory of an X pipe is to create a low pressure area behind the exhaust pulse when it crosses over into the opposite side and this aids in speeding up the pulse behind it and results in a scavenging effect. Positioning is vital depending on what the desired outcome is. Too close to the engine in high performance applications and it will actually reduce flow as the revs get up (high revs result in pulses that are close together and will cause pulses to crash into each other at the X) Further back and it will act as it should. In street driven or low to mid requirements (IE track work) too far back and it will pretty much do the same as the exhaust pulses are slower and further apart, they will also cool faster and "bank up" at the X. Sound wise, all X type merges tend to muddle the note as they combine all 8 pulses into each pipe because they are open to the flow from each header pipe.
 

MYVESSV8

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this is the exhaust that was fitted to my maloo ute (warranty-Xforce 2.5in ) anyway what effect would it have by putting in a H pipe and removing the X/merge/kiss pipe, i do have extractors etc
 
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