[Jason@JacFab]

My extrude honed exhaust manifold is done, and being shipped back today...

Will have pics and flow info compared to a stock manifold next week when it shows back up.

[Start The Machine]

Originally Posted by Jason@JacFab

My extrude honed exhaust manifold is done, and being shipped back today...

Will have pics and flow info compared to a stock manifold next week when it shows back up.

Sweet!! Cant wait to see that.

[Ashium]

Originally Posted by Jason@JacFab

My extrude honed exhaust manifold is done, and being shipped back today...

Will have pics and flow info compared to a stock manifold next week when it shows back up.

Nice! Can you check the back pressure also?
I just don't know how much could really be gained from a manifold. Most upgraded ones I've seen, just help the power band move to the left, we need it to stay level, or increase to the right. With the current turbo that is.

[Corner carver]

Originally Posted by Start The Machine

Sweet!! Cant wait to see that.

+1

[2SSRS@Gen5diy]

That will be i nice thing to see, we did it back in the day, it will add some HP but not as much as a new manifold, IMO.

[ChicagoTommy]

Originally Posted by 2SSRS@Gen5diy

That will be i nice thing to see, we did it back in the day, it will add some HP but not as much as a new manifold, IMO.

Yeah, you used to hear more about extrude honing back in the L98/4th gen LT1 days, so 20 years ago. It's a neat process, but imo it was always expensive for the gains.

[Scubacat]

Originally Posted by ChicagoTommy

Yeah, you used to hear more about extrude honing back in the L98/4th gen LT1 days, so 20 years ago. It's a neat process, but imo it was always expensive for the gains.

In the time since I posted this thread, I spoke with 2 other high quality shops and after looking at the application, pictures, etc they advised to......keep the factory part.

That's right. Keep the factory part. Basically they said that unless you building a 9/10's engine or better, it would be money poorly spent for our applications. Basically port, polish, and let it be. So, as expensive as the extrude hone is, if it shows any benefit, it's still half the cost of a tube manifold and looks stock.

Eager to see the finished product and flow numbers.

[ChicagoTommy]

Originally Posted by Scubacat

In the time since I posted this thread, I spoke with 2 other high quality shops and after looking at the application, pictures, etc they advised to......keep the factory part.

That's right. Keep the factory part. Basically they said that unless you building a 9/10's engine or better, it would be money poorly spent for our applications. Basically port, polish, and let it be. So, as expensive as the extrude hone is, if it shows any benefit, it's still half the cost of a tube manifold and looks stock.

Eager to see the finished product and flow numbers.

So you're saying they're saying to not run a tubular header? I'd agree that that is only for people looking to make maximum power, not for daily driven applications.

[Scubacat]

Originally Posted by ChicagoTommy

So you're saying they're saying to not run a tubular header? I'd agree that that is only for people looking to make maximum power, not for daily driven applications.

Yes, unless you are going balls out, the only thing it will do is make your wallet lighter. One guy mentioned that at first sight, it looked like a pretty efficient design.

[ChicagoTommy]

Originally Posted by Scubacat

Yes, unless you are going balls out, the only thing it will do is make your wallet lighter. One guy mentioned that at first sight, it looked like a pretty efficient design.

Then I can assure you that that person is an idiot.

[Scubacat]

Originally Posted by ChicagoTommy

Then I can assure you that that person is an idiot.

Im thinking that he means for our typical usage. Both said to make a tube manifold would net us nothing unless we were driving around at ridiculous RPM.

[ChicagoTommy]

Originally Posted by Scubacat

Im thinking that he means for our typical usage. Both said to make a tube manifold would net us nothing unless we were driving around at ridiculous RPM.

Yeah? So? That's what every other mod for these cars do. Most of the currently available mods don't make power til over 4000RPM. Obviously no one is driving around at 4000RPM constantly, but they're still buying mods for the gainz, bruh. Do you even lift, bruh?

[Scubacat]

Originally Posted by ChicagoTommy

Yeah? So? That's what every other mod for these cars do. Most of the currently available mods don't make power til over 4000RPM. Obviously no one is driving around at 4000RPM constantly, but they're still buying mods for the gainz, bruh. Do you even lift, bruh?

So, that seems to be what he meant by effiiecnt...efficient for how the car will be used VS the dollars spent for what would be gained for a custom manifold. On the face of it, it seems that an extruded OEM manifold MAY be a better bang for the buck....and then, maybe not. We don't know yet.

[ChicagoTommy]

Originally Posted by Scubacat

So, that seems to be what he meant by effiiecnt...efficient for how the car will be used VS the dollars spent for what would be gained for a custom manifold. On the face of it, it seems that an extruded OEM manifold MAY be a better bang for the buck....and then, maybe not. We don't know yet.

I can absolutely 100% guarantee that a custom tubular manifold will give more bang for the buck than the greatest extrude hone ever done in the history of the world.