[FoundNemo]

Originally Posted by Firecaptain

CW3SF, so the AWE gets rid of the "squished" pipes too?

Axle back does not, catback does. Removal of the squished pipes definitely improves the tone of the exhaust. Speaking from personal experience.

[CW3SF]

Originally Posted by Firecaptain

CW3SF, so the AWE gets rid of the "squished" pipes too?

The axleback does not, unfortunately. I am still debating whether or not I want to have a muffler shop replace that section. I’ve read on here that there’s no improvement to replace them. I still find that very hard to believe because it’s substantial.

[CW3SF]

C’mon UPS!

I hate waiting for these guys when I know I have something on the truck.

[CW3SF]

Finally here. Didn’t take long to complete the install.

[CW3SF]

This axleback (Stock headers, all 4 cats and stock mid pipes) sounds really good. It’s louder than I expected but it’s a good loud LOL.

http://youtu.be/b6hJBLrhwbY

[Android42019]

Originally Posted by CW3SF

This axleback (Stock headers, all 4 cats and stock mid pipes) sounds really good. It’s louder than I expected but it’s a good loud LOL.

http://youtu.be/b6hJBLrhwbY

And I got rid of the muffler completely lol....
https://youtu.be/3Y764nvkhEE

Really unlocks the sound of the car with that baggage out the way. Any tips on installing those reflectors?

[VinnAY]

Originally Posted by Stephen12ZL1

you will get a code for the exhaust flap actuators if you disconnected them which I see present on your factory suitcase.

You don't know what youre talking about. You're confusing AFM with NPP.

[FoundNemo]

Originally Posted by CW3SF

The axleback does not, unfortunately. I am still debating whether or not I want to have a muffler shop replace that section. I’ve read on here that there’s no improvement to replace them. I still find that very hard to believe because it’s substantial.

The Mishimoto article showing no gains was done on a 460hp SS camaro, not the ZL1. You do not lose much power in the 2.1" exhaust range that far downstream on an NA motor, but for a 650hp ZL1 there is a little room for improvement. Power, throttle response and tone are both improved when you replace the pre-crink area back to the tips.

My shop cut at the pre-crimp area, welded on 3" pipes from the pre-crimp to the OEM tips with Magnaflow y-splitters and Maxflow 3" x 6" long x 5" body resonators on each side and I had them Cerakote'd black. People saying there is no difference are wrong. The internal inlet on the muffler is down to 2.1", measured with a caliper when we removed it. Already dyno'd before after and was worth about 11rwhp and 14wtq SAE (muffler delete and crimp delete both). Not bad for $600 including coating/fabbing/etc, looks badass. Can definitely feel a smoother acceleration too at WOT in the upper rpm band like its not as choked up. I'm sure modding the OEM cats to allow more flow (they are also choked up) would be helpful too. I've been considering buying a lightly used set and replacing all the choke points with 2.5" pipe or better and re-installing but not sure how much it would help with the cats in place still.

And for folks who want to flame, have fun, I dont care

[CW3SF]

Originally Posted by Android42019

And I got rid of the muffler completely lol....
https://youtu.be/3Y764nvkhEE

Really unlocks the sound of the car with that baggage out the way. Any tips on installing those reflectors?

The reflectors were a pain. There’s only a tiny little slot there to get your screwdriver in and it’s not at a 90 degree angle to the screw head. There’s no easy way to get it done. Just use a magnetic tip driver and trial and error until you get old one out and the new one back in. I had to use the magnetic tip to fish the dropped screw out several times. Just stay persistent till you get it.

[Taylor123]

[QUOTE=FoundNemo;10796052]The Mishimoto article showing no gains was done on a 460hp SS camaro, not the ZL1. You do not lose much power in the 2.1" exhaust range that far downstream on an NA motor, but for a 650hp ZL1 there is a little room for improvement. Power, throttle response and tone are both improved when you replace the pre-crink area back to the tips.

My shop cut at the pre-crimp area, welded on 3" pipes from the pre-crimp to the OEM tips with Magnaflow y-splitters and Maxflow 3" x 6" long x 5" body resonators on each side and I had them Cerakote'd black. People saying there is no difference are wrong. The internal inlet on the muffler is down to 2.1", measured with a caliper when we removed it. Already dyno'd before after and was worth about 11rwhp and 14wtq SAE (muffler delete and crimp delete both). Not bad for $600 including coating/fabbing/etc, looks badass. Can definitely feel a smoother acceleration too at WOT in the upper rpm band like its not as choked up. I'm sure modding the OEM cats to allow more flow (they are also choked up) would be helpful too. I've been considering buying a lightly used set and replacing all the choke points with 2.5" pipe or better and re-installing but not sure how much it would help with the cats in place still.

And for folks who want to flame, have fun, I dont care

Where did you get the black spoiler?

[PROMETHEUS]

several vendors selling OEM ones on ebay. Just picked one up myself.

[FoundNemo]

[QUOTE=Taylor123;10796207]

Originally Posted by FoundNemo

The Mishimoto article showing no gains was done on a 460hp SS camaro, not the ZL1. You do not lose much power in the 2.1" exhaust range that far downstream on an NA motor, but for a 650hp ZL1 there is a little room for improvement. Power, throttle response and tone are both improved when you replace the pre-crink area back to the tips.

My shop cut at the pre-crimp area, welded on 3" pipes from the pre-crimp to the OEM tips with Magnaflow y-splitters and Maxflow 3" x 6" long x 5" body resonators on each side and I had them Cerakote'd black. People saying there is no difference are wrong. The internal inlet on the muffler is down to 2.1", measured with a caliper when we removed it. Already dyno'd before after and was worth about 11rwhp and 14wtq SAE (muffler delete and crimp delete both). Not bad for $600 including coating/fabbing/etc, looks badass. Can definitely feel a smoother acceleration too at WOT in the upper rpm band like its not as choked up. I'm sure modding the OEM cats to allow more flow (they are also choked up) would be helpful too. I've been considering buying a lightly used set and replacing all the choke points with 2.5" pipe or better and re-installing but not sure how much it would help with the cats in place still.

And for folks who want to flame, have fun, I dont care

Where did you get the black spoiler?

$250 remove/repaint/reinstall. Local shop with excellent work, repainted my OEM.

[Terry the Tramp]

Originally Posted by CW3SF

I pulled the fuse on the system the day I bought the car. So it doesn’t work anyway. No codes.

CW3SF - The fuse you pulled, please advise which it is and where it's located.
Thanks.

[Stephen12ZL1]

Originally Posted by VinnAY

You don't know what youre talking about. You're confusing AFM with NPP.

my bad VinnAY...honestly, I thought there was a powertrain code associated with the NPP disconnected. ZL1 doesn't have AFM and I understand that causes a powertrain code when disconnected on an SS. Sorry for the confusion.