Any gain from 3 inch header back?

[Dega Man]

I have the ARH 2 inch headers into the 3 inch X-Pipe then stepping down to 2.5 inch at the axle into the stock muffler. I do have head work, cam, 2.5 upper and 9.5 lower pulley. I have just ordered the ARH 3 inch mufflers for the ZL1, that will come with the 3 inch connection pipe from the X- pipe to the muffler. This will make me a complete 3 inch system. I am going to dyno both set-ups when they arrive and will let you know if it makes a difference from the axle back.

[2013 ZL1 #7860]

Originally Posted by SamHouseIII

Yes, I removed my Billy Boats 3in and NoWeeds because I was told I was loosing to much pressure (The was by Ted J, well respected here and I'll take his word any day). Not saying the flow was a factor, just the loss of pressure.

I'm sorry that you did that. I'd go back and enjoy the more efficient engine with more power and less stress...

I love my 3' Billy Boat!

[2013 ZL1 #7860]

Originally Posted by ZO6 Bryan

Once again, improved flow resulting in lower boost pressure is a good thing. It does not drop your actual power output. People need to STOP equating boost numbers to power output.

Too make it very clear.
If you do a mod that drops you boost pressure, you just increased you power output. You did not lose power.

[Shoe2ss]

do these #sound right or common? I have cheap cold air intake off amazon cheap 1 7/8 headers , 3" xpipe exhaust back to the factory npp mufflers with fuse pulled. no cats.. my dyno sheet says 434 hp and 453tq.. ls3. m6. does anyone else make more torque than hp?

[bayarea408]

Originally Posted by Shoe2ss

do these #sound right or common? I have cheap cold air intake off amazon cheap 1 7/8 headers , 3" xpipe exhaust back to the factory npp mufflers with fuse pulled. no cats.. my dyno sheet says 434 hp and 453tq.. ls3. m6. does anyone else make more torque than hp?

when i was all motor with those modifications i ended up with more torque then HP as well, at a similar ratio i might add. It was a tad conservative on the timing but the car was fantastic.

[Cooks ZL1]

Originally Posted by Dega Man

I have the ARH 2 inch headers into the 3 inch X-Pipe then stepping down to 2.5 inch at the axle into the stock muffler. I do have head work, cam, 2.5 upper and 9.5 lower pulley. I have just ordered the ARH 3 inch mufflers for the ZL1, that will come with the 3 inch connection pipe from the X- pipe to the muffler. This will make me a complete 3 inch system. I am going to dyno both set-ups when they arrive and will let you know if it makes a difference from the axle back.

Have you dynod with new mufflers? I have the same setup wit oem nap mufflers

[Dega Man]

Originally Posted by Cooks ZL1

Have you dynod with new mufflers? I have the same setup wit oem nap mufflers

I have done the install but have not been to the dyno yet, I hope to do so in early August.

[1LEric]

I gained 20whp 20wtq on a similar setup with high flow cats

[Dega Man]

Originally Posted by 1LEric

I gained 20whp 20wtq on a similar setup with high flow cats

That is very impressive I am catless. Did you see gains throughout the complete power band? I am looking forward to getting on the dyno as well I hope I see that type of gain, which all the pros are telling me that I want see much difference since I was 3 inch all the way to the axle anyway. Thanks for sharing.

[Little Walter]

Originally Posted by 1LEric

I gained 20whp 20wtq on a similar setup with high flow cats

You already had 3 inch to the axle? Then you gained an additional 20whp adding 3 inch from the axle back?

[GODZL1A]

Originally Posted by Dega Man

I have the ARH 2 inch headers into the 3 inch X-Pipe then stepping down to 2.5 inch at the axle into the stock muffler. I do have head work, cam, 2.5 upper and 9.5 lower pulley. I have just ordered the ARH 3 inch mufflers for the ZL1, that will come with the 3 inch connection pipe from the X- pipe to the muffler. This will make me a complete 3 inch system. I am going to dyno both set-ups when they arrive and will let you know if it makes a difference from the axle back.

How do you like the ARH mufflers as far as sound?

Dave

[robrocketanski]

My tuner's opinion is that the muffler makes more of a difference than the exhaust diameter. Basically the exhaust diameter isn't much of a restriction but a heavily baffled muffler could be. The same would go for cats I assume.

[Dega Man]

Originally Posted by GODZL1A

How do you like the ARH mufflers as far as sound?

Dave

The ARH have a mellow deeper tone also quieter until you really roll in the throttle and they come alive very much so. There is no drone with my setup.

[JANNETTYRACING]

I got a nice gain out of our modified Magnaflow 3 inch ZL-1 system.

My car feels stronger on the road coarse coming out of the corners and top end.

Of course the corners are 60-90 MPH LOL.

Ted.