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Old 07-07-2011, 09:17 AM   #151
Lgndryhr
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I don't mind the popping/gurgle noise as it revs down, but prefer it not to be there. I figure it is because the car is still a prototype, unrefined, etc. If it still does make that sound in final production then it is no big deal to me.
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Old 07-07-2011, 10:05 AM   #152
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I'm not crazy about the popping either, but most of the reving of the engine will be under load and not free reving, so the popping shouldn't be an issue.
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Old 07-07-2011, 10:16 AM   #153
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I think a lot of that popping will deminish after the car's warmed up. I noticed that when started cold, or even after the car hadn't been running for more than an hour, the exhaust note was more raspy. I'm sure, after the car warms up, that popping will pretty much not be there. Considering the 4 cats' and two resonators, I doubt it's going to be bad. What kind of person is really going to drive WOT on an FI car when it's not warmed up? Also - it's not like the car's going to sound like that unless you drive the car aggressive enough to result in the valves to open. If they're anything like the 'Vette system, I'm sure we're going to get a similar sound.

Here are the OEM dual-mode mufflers off 'Vettes (I think they're LS3 cars, but it shouldn't be too dissimilar from the LS7 and LS9 styles). The last couple images are the mods' some are doing to make these truly "open", if you will, so there are nearly no muffling with the valves open. Additionally, if I remember correctly, the 'Vette guys are also able to pull a fuse to disable the valves from closing, keeping them open all the time, which is pretty cool
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Old 07-07-2011, 10:20 AM   #154
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I think modifications along these lines are going to be GREAT alternatives to ABs or CBs, so long as the rest of the exhaust is large enough and free-flowing enough not to be a big restriction, much like SS exhaust (LS3) already is. I know one of the first mods' for me will be resonator eliminators, probably replace the OEM H-pipe with a good X-pipe, and cut the mufflers open for mods' like the ones shown. I'll probably leave the dual-mode function, though, because I don't want trouble from the "Man", . You guys doing LTs will probably benefit greatly from keeping the dual-modes from the OEM mufflers I imagine.

The exhaust is one of the many features I LOVE about ZL1
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Old 07-07-2011, 10:53 AM   #155
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Originally Posted by radz28 View Post
I think modifications along these lines are going to be GREAT alternatives to ABs or CBs, so long as the rest of the exhaust is large enough and free-flowing enough not to be a big restriction, much like SS exhaust (LS3) already is. I know one of the first mods' for me will be resonator eliminators, probably replace the OEM H-pipe with a good X-pipe, and cut the mufflers open for mods' like the ones shown. I'll probably leave the dual-mode function, though, because I don't want trouble from the "Man", . You guys doing LTs will probably benefit greatly from keeping the dual-modes from the OEM mufflers I imagine.

The exhaust is one of the many features I LOVE about ZL1

I agree about the dual mode function. There's no way I'm swapping out to an aftermarket exhaust, no matter how much better it sounds, if I lose the dual mode functionality.

I wonder if Akrapovic will offer a dual mode system similar to the one they offer in the Z06/ZR1? It's light and offers a deep aggressive tone while maintaining the dual mode functionality. Not cheap though.

http://www.akrapovic.com/car-exhaust...odel/z06-2009/

I'd go for that system (or a similar one from a different manufacturer) for sure if eventually offered, but I'll stick to the mild to wild switch at first.
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Old 07-07-2011, 11:09 AM   #156
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Originally Posted by Shurenuff View Post
I agree about the dual mode function. There's no way I'm swapping out to an aftermarket exhaust, no matter how much better it sounds, if I lose the dual mode functionality.

I wonder if Akrapovic will offer a dual mode system similar to the one they offer in the Z06/ZR1? It's light and offers a deep aggressive tone while maintaining the dual mode functionality. Not cheap though.

http://www.akrapovic.com/car-exhaust...odel/z06-2009/

I'd go for that system (or a similar one from a different manufacturer) for sure if eventually offered, but I'll stick to the mild to wild switch at first.
THAT'S SWEET!!! I like the Ti option I'd like to get a better understanding where their power improvement comes from. Maybe it's the better pipes or more straight-through muffler

I know that the dual-mode option for the LS3 cars was worth something like another 6 horse'. I imagine eliminating the perforated intermediate pipe function by either sealing it with band clamps or replacing it altogether with a solid pipe might free up a little more power since I imagine there'd be a little less turbulence, but I don't know for sure.

I'm really unlikey to go with a replacement system and alter it the way I'm thinking. I know I'd love the look of the polished stainless, but I don't know that I'll be under the car enough to appreciate it. So long as the OEM intermediate pipe are sufficient, I think I'll be pretty happy. If I win the Lotto, that's a different matter, lol

Thanks, BTW, for that link!!! That was really cool
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Old 07-08-2011, 12:54 PM   #157
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A good x-pipe should get rid of that popping. It did on my old Vette.
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Old 07-08-2011, 01:42 PM   #158
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Originally Posted by radz28 View Post
THAT'S SWEET!!! I like the Ti option I'd like to get a better understanding where their power improvement comes from. Maybe it's the better pipes or more straight-through muffler

I know that the dual-mode option for the LS3 cars was worth something like another 6 horse'. I imagine eliminating the perforated intermediate pipe function by either sealing it with band clamps or replacing it altogether with a solid pipe might free up a little more power since I imagine there'd be a little less turbulence, but I don't know for sure.

I'm really unlikey to go with a replacement system and alter it the way I'm thinking. I know I'd love the look of the polished stainless, but I don't know that I'll be under the car enough to appreciate it. So long as the OEM intermediate pipe are sufficient, I think I'll be pretty happy. If I win the Lotto, that's a different matter, lol

Thanks, BTW, for that link!!! That was really cool


Found another one from B&B exhaust that maintains the dual mode feature. It's not as light as the Akrapovic system (especially the titanium version), but it's not nearly as expensive. Even the regular stainless steel Akrapovic system is significantly more expensive than the price of this B&B product.

From reading reviews, it sounds really good while keeping the functionality of the OEM system. I hope they make a version for the ZL1, I'd be interested for sure.

http://www.bbexhaust.com/car/corvette/z06/
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