Car Chemistry two disc insert - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72c20customcamper · 03-27-2026, 09:49 AM

Anyone use these? I need to quiet down my exhaust on the 68 . Not so much for me but my neighbors. It’s not bad just cruising but I have a very steep incline for about 1/4 mile to get to my house and it’s way too loud when I’m in the throttle . Would rather not put resonators on it not enough room . I figured I could just put them in the tailpipe and I could adjust the sound by adding some SS packing

farmall · 03-27-2026, 08:29 PM

I tried the vortex cone in my 6X6. It had a turbo that sounded like a police whistle at all rpms. It worked ok.

Rambler62 · 03-29-2026, 05:41 PM

I have the car chemistry inserts on my 70 GMC that has a pretty stout LS motor in it and they sound great. I also have them on my 99 Suburban. I do not have mufflers on either. If I was to build another car I will use them again.

72c20customcamper · 03-29-2026, 08:27 PM

Quote:

Originally Posted by Rambler62

I have the car chemistry inserts on my 70 GMC that has a pretty stout LS motor in it and they sound great. I also have them on my 99 Suburban. I do not have mufflers on either. If I was to build another car I will use them again.

Thanks for the info . Are you using any packing or just the inserts? I’m planing on using them with the glass packs .

03-27-2026, 09:49 AM	#1
72c20customcamper Registered User Join Date: Jul 2018 Location: Catskill Mountains,NY Posts: 9,479	Car Chemistry two disc insert Anyone use these? I need to quiet down my exhaust on the 68 . Not so much for me but my neighbors. It’s not bad just cruising but I have a very steep incline for about 1/4 mile to get to my house and it’s way too loud when I’m in the throttle . Would rather not put resonators on it not enough room . I figured I could just put them in the tailpipe and I could adjust the sound by adding some SS packing Attached Images __________________ Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary.

03-27-2026, 08:29 PM	#2
farmall Registered User Join Date: Jun 2011 Location: Central OR Posts: 830	Re: Car Chemistry two disc insert I tried the vortex cone in my 6X6. It had a turbo that sounded like a police whistle at all rpms. It worked ok. __________________ 1955 GMC 250 8 Flatbed 1971 C30 157" 350 4spd 10' Flatbed 81 GMC K30 CnC 9' Flatbed 454 T400 89 GMC Jimmy Stock https://67-72chevytrucks.com/vboard/...d.php?t=810958 71 LT1 Convertible, 72 Coupe 69 CJ5, 75 CJ6, 67 M715, 72 M35A2 Bobbed, 95 XLC2

03-29-2026, 05:41 PM	#3
Rambler62 Registered User Join Date: Apr 2017 Location: Freeport Fl Posts: 40	Re: Car Chemistry two disc insert I have the car chemistry inserts on my 70 GMC that has a pretty stout LS motor in it and they sound great. I also have them on my 99 Suburban. I do not have mufflers on either. If I was to build another car I will use them again.



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