1981 Corvette – Modified 1970 LT-I Engine
Chassis dyno: 324HP @5700 RPM / 349 ft-lbs torque @3700 RPM
3” Exhaust w/Dynomax 3” I/O bullet mufflers.
Over decibel limit (95dB)
3500-6000 RPM under acceleration
50 feet – 86 decibels
Sounds like an awesome 100dB inside the car – most impressed with the measured 86dB.
Hello, Some time ago I purchased a pair of your 3-disk inserts (4-inch) and installed them in the collector of my headers. The car is a 55 Chevy with a supercharged & nitrous injected 468 BBC. The headers are fenderwell exit and aside from the headers and the inserts, there is no exhaust system. At cruise on the freeway (approx 3000 rpm) I’ve had the experience of CHP (California Highway Patrol) cars cruise alongside me for a distance and then decide to move on because I wasn’t loud enough in their opinion to investigate further. With the headers being fenderwell exit, it’s quite loud inside the car because the headers dump out just in front of the windows, but I’ve had many people tell me that the car sounds like a bunch of motorcycles traveling together. I’m happy and so far, so are the police.
Ken just installed a set of inserts on my 98 Silverado-350 Vortec and I'm
really impressed. It did everything you said it would do, it's fairly mellow
at cruising speed, like you are down a gear, and when you step on it really
opens up. Thanks for a good product .I've been involved in racing my whole
life and have never used a product like this. I'm very happy.
Ken, I want to give you some feedback on your inserts. I spoke with you a while back about using your inserts in some straight pipe to replace the aftermarket mufflers I was running on my 96 Impala SS. I bought 2 sections of 20 inch 304 stainless pipe locally and inserted the 3 disk inserts you suggested in them. I mounted them in the stock location, which is just in front of the
rear axle. I was looking for a performance sound but without the drone I currently had.
I am happy to say that I like the new sound and I haven't heard any droning yet under any conditions. I still have the stock exhaust manifolds and cats. The sound is slightly louder and more aggressive than my previous setup but without the booming or drone that was really annoying at constant slow speeds and at highway speed (around 70mph).
I am pleased. Thanks for your help.
Just wanted to let you know that I received the muffler for my truck and had it installed on that Friday ... love it ... good deep sound. Truck feels like it has more mid range power than before.
Well, I’m a believer. I ordered a pair of your 3 disk 3” units for our SCCA 1994 LT1 “ITE” class racer for Laguna Seca which makes us meet 90db at 50’ from the track in turn 5. We put one in each collector and routed the exhaust away from the sound meter (which was on the driver’s right) to the driver’s left side exit…and even under full throttle in 4th gear going up hill by the sound meter we met 90db limit (they actually recorded a high of 88db for us)…jeez, guys, these things worked and I passed on your “secret” to three other guys who went over limit and couldn’t race… like me they’re buying them from Jeg’s, a great catalog company. So, thanks again.
The car has a 3 ½” header with two – 2 chamber mufflers to the rear axle and before installing the inserts it was simply unbearable to ride in the car due to the noise level. The inserts were very easy to install as they slide into the header attached by rivets and reduced the noise level so much that my wife can actually ride in the car without ear protection!
As discussed, we installed 3 disk directly into the header and would like to report that we cannot see any reduction in power output only in sound level inside and outside the car. I would recommend to anyone needing to reduce noise levels due to laws or personal taste to try Car Chemistry “disk inserts.” I am totally satisfied with the performance, ease of installation and results of your product.
I’m very happy to say that I’m greatly impressed by the great results your inserts brought to my exhaust.
It was short enough to fit in the space between the cat converter and the first resonator. Then eliminated the muffler and prepared a “Y” extension, added the muffler tips and the look was complete.
Man, when I started the car I almost didn’t believe how quiet inside it was. It’s almost factory level, the only difference is the tone, you can hear the new deep sound far away. Outside is different, louder, but a nicer tone than all the mufflers. That insert is great, nobody at the shop believed it. Accelerating the sound climbs, but is never intrusive, outside it’s evident but I don’t think it’s bothersome.
Leo I thank you, this was the alternative, I just wish I could’ve asked you before. A lot of money went out on this.
Well, I’ll be recommending your product everywhere and especially at the Nissan communities.
Hi I e-mailed you about a year ago about being able to use the CC Inserts on my stock 91 Formula 350. When I first got the car the converters had been removed for off road use and a (Performance) muffler installed into the stock system. A trip of any length was out of the question as it had a terrible sound at about 2200 rpm we used to call “racking” when I was a kid and glass packs ruled. I asked around and was told a (other performance) system was much quieter so on we went the complete (other performance) system with 3” intermediate pipe. Better but it still had that “racking” sound especially when the car was in choke mode, I guess the mufflers on those cars are just so far back. So I got a 2 disk insert to use in conjunction with the (Other performance) muffler and cut the 3” pipe as close to the front as possible and welded it in a few Saturdays ago and just like magic, no more “racking” and I have a much more pleasant tone with a much happier wife. As a side benefit it seems a little more responsive.
I removed the first disk as you said in your e-mail dated 4/24/01.
This is on my 302 Engine, as I said before with the full insert I lost almost a half second and of course MPH. Yesterday was the first time we got to run because of rain. The first pass after I re-jetted carb. And new plugs was a 12.53 at 106 MPH. This was at noon. The next pass at 2:13 in the afternoon at about 65 degrees was 12.52 at 106 MPH. The next one was at 3:53 in the afternoon same temp. 12.61 at 106 MPH. The last one was a 12.57 at 106 MPH. So you can see I have got my ½ second back. I cut one disk and about an inch and a half of the front that faces the header tubes and put my extension back on (18” extension) and read my decibel meter at 50’ at 3500 RPM and it read 93db the same as my Capri with Flowmasters. We are going to remove one disk from my sons 460 as it reads 90db. Big blocks are not as noisy anyway.
Thanks for your time on this. Hope this helps you some.