Exhaust kits - Chevelle Tech
Headers and Exhaust Discussion related to Exhaust systems and headers.

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post #1 of 27 (permalink) Old Dec 15th, 19, 9:26 PM Thread Starter
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Exhaust kits

Looking into the Flowmaster American thunder 64-66 A body with 40 series mufflers behind shorty headers. Has anyone used one of these type of kits? Looking for a some what quiet highway ride, more noise WOT. Any thoughts?

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post #2 of 27 (permalink) Old Dec 15th, 19, 9:37 PM
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Re: Exhaust kits

Sort of, I got the 2.5 inch ID pre-bent, Mandrel bent Tail Pipes, Mufflers, Hangers, clamps, nut, bolts, and a 2.5 ID "X" Pipe piece and took them to a local Muffler Shop (the muffler guy is well respected in the area) and had them fabricate the head pipes and fully weld up the system. VERY NICE!

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post #3 of 27 (permalink) Old Dec 15th, 19, 9:47 PM
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Re: Exhaust kits

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Originally Posted by Mikes64 View Post
Looking into the Flowmaster American thunder 64-66 A body with 40 series mufflers behind shorty headers. Has anyone used one of these type of kits? Looking for a some what quiet highway ride, more noise WOT. Any thoughts?
The FM 40 series won't be highway quiet.An H pipe or X pipe will quiet that type of system down if you use the 40 series muffs.
Also for quieter muffs with louder WOT then you want the turbo type mufflers lot of people have them on their Chevelle's and ElCamino's.Some even complain they're too quiet (me included).There are lots of information on the subject of exhaust if you search.
Why did you choose shorty headers ?

https://www.chevelles.com/forums/360...ers-again.html

You should find some good info in this link,especially read post #16.
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post #4 of 27 (permalink) Old Dec 15th, 19, 10:23 PM
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Re: Exhaust kits

Want quiet with power? Dynomax.

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post #5 of 27 (permalink) Old Dec 16th, 19, 12:31 AM
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Re: Exhaust kits

X2 on why you want the shorty headers..the 40s are loud...period. On the highway, they drone and it seems like everything in the car vibrates. I switched to some welded UltraFlo mufflers and Iím a lot happier with them. If your set on Flowmasters, the longest 50 series should work also...
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post #6 of 27 (permalink) Old Dec 16th, 19, 6:53 AM Thread Starter
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Re: Exhaust kits

I probably pulled the trigger a little early on the shortyís, was worried about clearance with ground to trans cross member with a 2Ē drop. I probably would have been ok, but thatís a done deal. Going to look into the above recommendations. Any more are welcome.

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post #7 of 27 (permalink) Old Dec 16th, 19, 1:12 PM
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Re: Exhaust kits

The above advise is spot on. 40's will be loud period. You should consider Flowmaster kit #17107 if you want an H-pipe system, or Pypes kit SGA10 or SGA30 if you want an X-pipe or straight dual system. Flowmaster is aluminized steel, Pypes is 409 stainless. Either system is without mufflers, so you can use whatever offset/offset muffler you want. Flowmaster makes a 50 series muffler which is quieter and greatly reduces drone. There is a Delta50 and Super50 muffler- Super50 is quieter. Dynomax Super Turbo is a favorite and for good reason. They come in 3 lengths - 14", 16",& 20" so you can choose your sound level. No drone, high flow, and a beautiful muscle car sound.

https://classicmusclecarexhaust.com/...flers-flo17107
https://classicmusclecarexhaust.com/...s/a-body/pypes
https://classicmusclecarexhaust.com/...turbo-mufflers
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post #8 of 27 (permalink) Old Dec 16th, 19, 2:45 PM
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Re: Exhaust kits

I had FM 40's on a 96 ram 318 true 2.5" duals and were way too loud, went to a muffler shop and they added turbos behind the 40's and it sounded good, I should've had them remove the FM junk and put them on Clist to get some $ back, now 3" Pypes with X pipe & violators


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post #9 of 27 (permalink) Old Dec 16th, 19, 4:29 PM
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Re: Exhaust kits

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I had FM 40's on a 96 ram 318 true 2.5" duals and were way too loud, went to a muffler shop and they added turbos behind the 40's and it sounded good, I should've had them remove the FM junk and put them on Clist to get some $ back, now 3" Pypes with X pipe & violators
I'm sure those 3" Violators are whisper quiet!..lol
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post #10 of 27 (permalink) Old Dec 16th, 19, 4:45 PM
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Re: Exhaust kits

I forgot to mention the Pypes exhaust is on the Chevelle lol and it's only real loud when you step on the loud pedal, but I also have bad hearing, I'd look into the Pypes SS system minus mufflers and go online to listen to different mufflers


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post #11 of 27 (permalink) Old Dec 16th, 19, 9:24 PM
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Re: Exhaust kits

Ok, I'll go against the majority, I have a SS flow master kit with an H-pipe and 40's that came with the kit, I'm also running Doug's full length headers. Before I had the back seat in and the interior completed I thought it was too loud, actually I liked it but my wife was not thrilled. I actually bought some FM 50's but once I completed the interior, including installing the back seat, the 40's are fine. I returned the 50's. I'm running a basically stock 396 convertible (rag top may reduce any droning) but I also applied both steps of the lizard skin and jute under the carpet. My wife and I did the Power Tour last year and sound was never a problem, pretty quite cruising, but sounds good when needed.

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post #12 of 27 (permalink) Old Dec 17th, 19, 8:26 AM Thread Starter
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Re: Exhaust kits

After a bit of research I'm leaning on the Pypes SGA10, I like the fact that they are stainless with a cross over as apposed to aluminized. I've also read that the Turbo mufflers tend to be a little quieter on the highway. I didn't mention that exhaust will be behind a 6.0L completely stock. I intend to put a lot of highway miles on this, will look at some videos to see what others sound like, Thanks for the links/advise.

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post #13 of 27 (permalink) Old Dec 17th, 19, 10:17 AM
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Re: Exhaust kits

Regretfully I abused my hearing all my life to the point of needing hearing aids and also suffer from severe tinnitus. I'm at the point in my life where I hate loud so I run Dynomax Super turbo mufflers on my 468, 2.5" from the headers back to the tailpipes turned down behind the rear bumper. They are reasonably quiet, sound mellow until you push the fun pedal down, and flow better than most mufflers out there.

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post #14 of 27 (permalink) Old Dec 17th, 19, 11:34 AM
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Oldscutlass,
which size Super Turbo did you use- 14”,16”,or 20”?
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post #15 of 27 (permalink) Old Dec 17th, 19, 10:29 PM
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Re: Exhaust kits

Quote:
Originally Posted by Mikes64 View Post
I probably pulled the trigger a little early on the shortyís, was worried about clearance with ground to trans cross member with a 2Ē drop. I probably would have been ok, but thatís a done deal. Going to look into the above recommendations. Any more are welcome.
If those shorty's are from Summit or Jegs you could probably return them for a credit exchange to get some long tube headers.Summit stepped up big time for me when I had a year and a half yr old clutch set for a 10 spline when I needed 26 spline clutch.They gave me full credit for the 10 spline and then I paid for the leftover with a CC .Really great place to deal with,I bet Jegs would give similar treatment too.

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