When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
So I have a new 2019 stingray with the performance exhaust. I picked up the car and drove it back from NJ to CO. I have had it in sport mode from the time I picked it up. It now has 3000 miles on it. So the question is why are the 2 exhaust pipes in the middle clean and the outside 2 dirty. Should all 4 pipes basically be the same in the amount of carbon on them? Could I have an issue?
No issue, normal. When in Sport the exhaust comes out the outer pipes, not the inside. I clean mine off every 100 miles or so. Wet paper towel wipes them clean.
Do a search, this is asked all the time by new owners so there is an abundant amount of info in numerous threads.
In modes I rarely use, Weather, Eco and Tour. There’s also the driving setting like Stealth. I’ll use Stealth when I have to drive and be really quite. I set mine to stay in Sport or Track regardless of the driving mode I’m in.
The outside pipes are essentially straight pipes with perforations in the muffler so that when the valves close them off the exhaust is force routed through the muffled section and to the inner pipes. With most folks staying in sport or track, the valves (and therefore straight pipes) stay open most of the time and so the carbon buildup accumulates on the outers. It's not that the inner is shut off, it's really the path of least resistance.
the pic below shows how it works on the Camaro system. It’s a good illustration and while it looks different than the C7 because it’s one large unit, the function is nearly identical.
In this pic, the NPP valve on the far right pipe is OPEN and in LOUD mode (like yours). When closed you can see that the gas would be forced through that pipe's perforations and if you follow it, would actually go to the OTHER side's inner (quiet) pipe (second from the left).
Great visual. Thanks.
now if I could figure out why the passenger side gets dirtier faster than the drivers side.
Interesting, it shouldn't. I wonder if your driver's side NPP valve is sticking closed a little and forcing more through the quiet side even when 'open'. Take a look at both valves in both modes (open/closed) to see if they both open up all the way.
Quick upload of fully open and closed (easier if you have a M2W switch)
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.
High performance exhaust question
