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Just as info, they're actually resonated testpipes, not catalytic converters. Judgement free zone here, just making sure you're aware of what you're ordering. I do like the standoffs to reinstall the factory heatshields!
^ I can see what appears to be a cat core in one of the pics, the cells however look very large, likely not of much actual benefit.
My opinion, they aren't worth the money for likely no palpable gains.
^ I can see what appears to be a cat core in one of the pics, the cells however look very large, likely not of much actual benefit.
My opinion, they aren't worth the money for likely no palpable gains.
You're seeing the holes of a straight-through resonator. These EOS pipes do not contain cat cores.
The advantage to these testpipes vs. others is the resonator to mellow the tone slightly, a built-in o2 sensor spacer to help prevent a CEL, and the standoffs to allow for reinstallation of the factory heatshields for a stock appearance at quick glance.
^^^ If you're correct (and I'm not saying that you aren't), that some pretty misleading information that they are peddling.
That'll happen with Chinese goods
C8 EOS "cat" aka resonated testpipe
No different than 2M and a bunch of others, regardless of what grandiose claims they make. Kinda like how every online retailer now suddenly has their own titanium system...that look oddly similar to the eBay junk
Rebranding/repackaging has become huge business across the industry.
No different than 2M and a bunch of others, regardless of what grandiose claims they make. Kinda like how every online retailer now suddenly has their own titanium system...that look oddly similar to the eBay junk
Rebranding/repackaging has become huge business across the industry.
Does that make them less effective than the parts that are priced 10x higher? I don't mind paying more for American labor and products, but I take affront to overcharging for said products.
Does that make them less effective than the parts that are priced 10x higher? I don't mind paying more for American labor and products, but I take affront to overcharging for said products.
Depends on what you're thoughts on quality & longevity are, and of course actual impact on emissions and not setting off a CEL w/o having to do hacks/tricks to fool the system. Fitment on items with complex bends/flanges can sometimes be questionable too.
Would I run cheap Chinese headers? Nope. I've experienced firsthand a failure due to thin metal and poor welds that close to the heat source.
I bought 49-state EPA cats for my C8 because I wanted them to actually perform the intended job, and not deal with CELs. On past vehicles that I have run testpipes though, I've found the resonated Chinese ones to be fine and hold up satisfactorily. When running a cat-delete testpipe, I do like the resonated versions as they take away a little bit of the harshness to mellow out the tone. I don't want people getting me wrong, I'm not trying to steer anyone away from these EOS pipes, I just want people to be aware of what they're actually buying (i.e. not a catalytic converter). If I decided to ever go catless on a C8, it would absolutely be these EOS pipes as they're resonated, contain a built-in o2 sensor spacer, and allow for reinstallation of the factory heatshields which is good for multiple reasons.
Does that make them less effective than the parts that are priced 10x higher? I don't mind paying more for American labor and products, but I take affront to overcharging for said products.
You also need to look at what you're buying. Cats are a perfect example as you really do get exactly what you pay for. Quality/effective catalytic converter cores are expensive as they contain precious metals, that like everything else, aren't getting any cheaper (although raw material and commodity prices have come down slightly post-pandemic).
There are multiple levels of cat cores, and along with price comes effectiveness. Cheap generic cats are pointless; just get testpipes. If you want real cats that actually do the job while increasing flow/performance, then you're looking at something either from GESi or HJS. GESi cores often used on the C8 are EPA 49-state G-Sport GEN2 S-wound 400-cell cores, and sourced from North America (Corsa, Kooks, Cicio, Paragon, aFe, CPR, etc.). Meanwhile, HJS cores are 200-cell cores sourced from Germany and are European emissions certified (FabSpeed & Soul).
I personally bought my Corsa cats for around $1,250 brand new from an authorized retailer/forum sponsor, and was able to get about half that back by recycling my stock cats. Prices have gone up since then, but it at least gives you an idea.
You're seeing the holes of a straight-through resonator. These EOS pipes do not contain cat cores.
The advantage to these testpipes vs. others is the resonator to mellow the tone slightly, a built-in o2 sensor spacer to help prevent a CEL, and the standoffs to allow for reinstallation of the factory heatshields for a stock appearance at quick glance.
I've read that the standoffs for the O2 sensors aren't enough to prevent the CEL. Is that correct? I'd honestly just go with the delete setup if standoffs were enough.
I've read that the standoffs for the O2 sensors aren't enough to prevent the CEL. Is that correct? I'd honestly just go with the delete setup if standoffs were enough.
Results are mixed... You'll probably need to add a mini-cat or angled spacer from Big Daddies Garage: http://www.bigdaddiesgarage.com/
You also need to look at what you're buying. Cats are a perfect example as you really do get exactly what you pay for. Quality/effective catalytic converter cores are expensive as they contain precious metals, that like everything else, aren't getting any cheaper (although raw material and commodity prices have come down slightly post-pandemic).
There are multiple levels of cat cores, and along with price comes effectiveness. Cheap generic cats are pointless; just get testpipes. If you want real cats that actually do the job while increasing flow/performance, then you're looking at something either from GESi or HJS. GESi cores often used on the C8 are EPA 49-state G-Sport GEN2 S-wound 400-cell cores, and sourced from North America (Corsa, Kooks, Cicio, Paragon, aFe, CPR, etc.). Meanwhile, HJS cores are 200-cell cores sourced from Germany and are European emissions certified (FabSpeed & Soul).
I personally bought my Corsa cats for around $1,250 brand new from an authorized retailer/forum sponsor, and was able to get about half that back by recycling my stock cats. Prices have gone up since then, but it at least gives you an idea.
Yup only true GESI are worth doing if you want cats, what separates ours from the others is OEM fitment with threaded studs just like GM and takes all OEM gaskets unlike others that have you just RTV or use a hope and a prayer gasket. We also make our stuff right here (minus the cat) No outsourcing here or slapping our name on something we didn't actually make.
You also need to look at what you're buying. Cats are a perfect example as you really do get exactly what you pay for. Quality/effective catalytic converter cores are expensive as they contain precious metals, that like everything else, aren't getting any cheaper (although raw material and commodity prices have come down slightly post-pandemic).
There are multiple levels of cat cores, and along with price comes effectiveness. Cheap generic cats are pointless; just get testpipes. If you want real cats that actually do the job while increasing flow/performance, then you're looking at something either from GESi or HJS. GESi cores often used on the C8 are EPA 49-state G-Sport GEN2 S-wound 400-cell cores, and sourced from North America (Corsa, Kooks, Cicio, Paragon, aFe, CPR, etc.). Meanwhile, HJS cores are 200-cell cores sourced from Germany and are European emissions certified (FabSpeed & Soul).
I personally bought my Corsa cats for around $1,250 brand new from an authorized retailer/forum sponsor, and was able to get about half that back by recycling my stock cats. Prices have gone up since then, but it at least gives you an idea.
Im getting 200 cell HJS Cats from Kline- any thoughts here?
I've never heard of Kline before (Porsche vendor?), but as long as its a legit HJS core there shouldn't be a problem.
Ok thanks, yeah they are better known for their Porsche exhausts along with other Euro nameplates like Audi, Ferrari, etc but they are dabbling here with the C8Z and my tuner swears by them so I took a flyer with a test price
I did validate that its 200 HJS so I am happier now with your reply- thanks.
And if I replace the rear section Ill have to do the valve relearn process? Any unit you suggest vs going to the Stealer?
Ok thanks, yeah they are better known for their Porsche exhausts along with other Euro nameplates like Audi, Ferrari, etc but they are dabbling here with the C8Z and my tuner swears by them so I took a flyer with a test price
I did validate that its 200 HJS so I am happier now with your reply- thanks.
And if I replace the rear section Ill have to do the valve relearn process? Any unit you suggest vs going to the Stealer?
If you don't touch the catback portion of the exhaust, there will be nothing to relearn. If you do go ahead and add the catback section, you can skip the dealer and perform the relearn processes (2 AFM + 2 NPP valves) yourself using a bidirectional scantool. Many of us are using this one since it's cost effective ($129 w/clickable coupon at the moment) and works fairly well once you get a hang of the user interface (free updates too):
You're seeing the holes of a straight-through resonator. These EOS pipes do not contain cat cores.
The advantage to these testpipes vs. others is the resonator to mellow the tone slightly, a built-in o2 sensor spacer to help prevent a CEL, and the standoffs to allow for reinstallation of the factory heatshields for a stock appearance at quick glance.
Prior to seeing this image, it appeared that there was some type of core in one of the images on that website,.
There are no straight-thru pics of the pipes on the website, definitely misleading.
Originally Posted by Kracka
That'll happen with Chinese goods
C8 EOS "cat" aka resonated testpipe
No different than 2M and a bunch of others, regardless of what grandiose claims they make. Kinda like how every online retailer now suddenly has their own titanium system...that look oddly similar to the eBay junk
Rebranding/repackaging has become huge business across the industry.
EOS High Flow Cats
