Member Profile - Ferret

[McDoof]

The car is looking good mate.
Exhaust work is such a black art. Should be done by rocket scientists. I spoke with 3 exhaust specialists when trying to design my system and none were really any help. All had good answers to how do I get flow. Nobody had good answers to questions like what resonator or muffler reduces rasp or drone.

[ferret89]

The car is looking good mate.
Exhaust work is such a black art. Should be done by rocket scientists. I spoke with 3 exhaust specialists when trying to design my system and none were really any help. All had good answers to how do I get flow. Nobody had good answers to questions like what resonator or muffler reduces rasp or drone.

Cheers mate.

Haha yes it does seem to be hard to find consistent advice, although Trevor at CES did say that they usually find that you'll lose about 5kw at your top end by sticking with stock mufflers. Which is pretty much what Alexei said earlier in the thread that they restrict around 5kw or so.

From what I heard standard resonators or hotdogs do very little to reduce rasp and drone and mid mufflers are the way to go for that.

[McDoof]

The car is looking good mate.
Exhaust work is such a black art. Should be done by rocket scientists. I spoke with 3 exhaust specialists when trying to design my system and none were really any help. All had good answers to how do I get flow. Nobody had good answers to questions like what resonator or muffler reduces rasp or drone.

Cheers mate.

Haha yes it does seem to be hard to find consistent advice, although Trevor at CES did say that they usually find that you'll lose about 5kw at your top end by sticking with stock mufflers. Which is pretty much what Alexei said earlier in the thread that they restrict around 5kw or so.

From what I heard standard resonators or hotdogs do very little to reduce rasp and drone and mid mufflers are the way to go for that.

Been doing some research and I think I might get one of these when it comes time to do the mid section. Lots of good reviews and YouTube vids.
http://www.amazon.com/Vibrant-1141-Ultra-Quiet-Resonator/dp/B000E3VHWI

[shav]

Same here. Thinking of adding a mid muffler to my system to tone it down a notch or 2. Not that I dont love hearing the boxer note, just that sometimes I like peace and quiet too.

[McDoof]

Forgot to add the link in my post.
http://www.amazon.com/Vibrant-1141-Ultra-Quiet-Resonator/dp/B000E3VHWI

[ferret89]

Same here. Thinking of adding a mid muffler to my system to tone it down a notch or 2. Not that I dont love hearing the boxer note, just that sometimes I like peace and quiet too.

Do it, you'll love it. I had a Magnaflow one on my 04 GT it improved the note in every way... less drone, deeper sound and a little quieter

[shav]

Same here. Thinking of adding a mid muffler to my system to tone it down a notch or 2. Not that I dont love hearing the boxer note, just that sometimes I like peace and quiet too.

Do it, you'll love it. I had a Magnaflow one on my 04 GT it improved the note in every way... less drone, deeper sound and a little quieter

Awesome. Will do.

[peadya100]

My tuner was telling me the other day that he's done quite a bit of back to back testing on the Y pipes for the liberty's... he found that on a 3" exhaust, a full 3" Y pipe gave a power increase. You wouldn't think it'd make a difference if your mid pipe is 3" but there you go.

[THE SpecB]

My tuner was telling me the other day that he's done quite a bit of back to back testing on the Y pipes for the liberty's... he found that on a 3" exhaust, a full 3" Y pipe gave a power increase. You wouldn't think it'd make a difference if your mid pipe is 3" but there you go.

Xforce systems are 3inch inc Y pipe

[ferret89]

My tuner was telling me the other day that he's done quite a bit of back to back testing on the Y pipes for the liberty's... he found that on a 3" exhaust, a full 3" Y pipe gave a power increase. You wouldn't think it'd make a difference if your mid pipe is 3" but there you go.

Is that MSR? I read that and his theory that 3" all the way is the best for turbo. While I'm certainly not qualified to disprove his research I don't think a 3" vs a 2.5" Y-pipe would make much of a difference on a stock turbo

The XForce system is definitely a 2.5" Y-pipe btw

[THE SpecB]

My tuner was telling me the other day that he's done quite a bit of back to back testing on the Y pipes for the liberty's... he found that on a 3" exhaust, a full 3" Y pipe gave a power increase. You wouldn't think it'd make a difference if your mid pipe is 3" but there you go.

Is that MSR? I read that and his theory that 3" all the way is the best for turbo. While I'm certainly not qualified to disprove his research I don't think a 3" vs a 2.5" Y-pipe would make much of a difference on a stock turbo

The XForce system is definitely a 2.5" Y-pipe btw

Msr claims 3inch Dan

[peadya100]

Yeah that's MSR. I have Xforce, it's 3" to 2.25" for the Y pipe on mine (may have changed though now). Which is exactly half of 3" in cross sectional area. That would obviously mean no restriction. But he claims that a 3" Y section does improve peak power slightly. Either way I wouldn't think it'd be much, just interesting to know.

[kiwigene]

Yeah that's MSR. I have Xforce, it's 3" to 2.25" for the Y pipe on mine (may have changed though now). Which is exactly half of 3" in cross sectional area. That would obviously mean no restriction. But he claims that a 3" Y section does improve peak power slightly. Either way I wouldn't think it'd be much, just interesting to know.

3" pipe is ~7" area
2.25" y-pipe is ~8" area
2.5" y-pipe is ~10" area
and 3" y-pipe is ~14" area

But would also depend on how the actual y-pipe is made and what the area is at the y-split.
I would guess though, even a badly welded 2.25" y-pipe is going to perform as effectively as if it's straight through until it hits the mufflers.

[ferret89]

Yeah that's MSR. I have Xforce, it's 3" to 2.25" for the Y pipe on mine (may have changed though now). Which is exactly half of 3" in cross sectional area. That would obviously mean no restriction. But he claims that a 3" Y section does improve peak power slightly. Either way I wouldn't think it'd be much, just interesting to know.

3" pipe is ~7" area
2.25" y-pipe is ~8" area
2.5" y-pipe is ~10" area
and 3" y-pipe is ~14" area

But would also depend on how the actual y-pipe is made and what the area is at the y-split.
I would guess though, even a badly welded 2.25" y-pipe is going to perform as effectively as if it's straight through until it hits the mufflers.

Looking at that photo I posted of the XForce Y-pipe you can see it starts at 3" then tapers to 2.5" at the split

It feels like it pulls harder than before, but hard to know if I'm imagining it because of the extra noise? I have no doubt that it flows a lot better than the stock pea shooters did though

[ferret89]

New video done a week after install

I think it sounds better in person, the camera just doesn't seem to do it justice

https://www.youtube.com/watch?v=9Z3WY3AH1vE&feature=youtu.be