Don Terrill’s Speed-Talk

You need to try Borla's you will like the performance and the way it will run and sound.

GT50 wrote: ↑Fri Jun 19, 2020 5:55 am

F-BIRD'88 wrote: ↑Fri Jun 19, 2020 12:27 am Have someone else drive the truck so you can evaluate the exhaust tone from outside at a distance...
There is a sweet sounding exhaust , then there is is a exhaust that just pisses every one off, including you eventually..
If the exhaust terminates under the truck VS at the rear bumper it is going to get old quick... The H pipe is a good idea.. I build my own custom mufflers.

Look what Ford did with the late Mustangs..
I took a California Special 6 Speed rag top for a ride .
As soon as you fire it up... Its like " Ya Baby"!!! (Austin Powers) ♪♪♪

Can you show the inside of your custom muffler? If it's not top secret.

You need LEVEL #5 clearance ha ha
Give me a bit and I will dig up a drawing..

What about the old SONIC TURBO mufflers?

Do they still make those?

The Sonic Turbo is similar to my custom muffler.
Its not exactly the same but uses similar ideas.
I had not seen the guts of a sonic turbo when I did mine.
I think these are good.. My custom mufflers worked very well..
http://www.studiodino.com/images/muff_box.jpg

My 88 Firebird had a pair of my custom built mufflers 2.5" in out


Had a aggressive idle but nicer and quieter than flowmasters. Not over the top when @Wot either..
Same drag perf as open headers. Actually just a hair quicker.

Best with headphones

on both sizes of STs the drone was at 1900-to 2100ish.None up to it and none after it.My car has a TKO and that is where I drive it on the highway and in 4th at 2000 on city streets!The 14in was 86 decibels at 2000 and the 18s were 84.I now have a set of just non performance 18s and they are 82.Im might try the HPs and if they suck I might change my 3.31s to like 3.55s to keep me out of that range.Tom

Any thoughts on this style compared to the holes inner tube design.

https://scontent.fmel6-1.fna.fbcdn.net/ ... e=5F120EBD

https://scontent.fmel6-1.fna.fbcdn.net/ ... e=5F12AF5D

https://scontent.fmel6-1.fna.fbcdn.net/ ... e=5F1492F2

I can't imagine those slits sucking up much sound...

Let it breath...

MadBill wrote: ↑Fri Jun 19, 2020 11:31 pm I can't imagine those slits sucking up much sound...

Dumped at the diff 3 inch with x-pipe......



With tail pipes 3.5 inch with x-pipe......

If you watch Roadkill then you know of the Muscle Truck, it used larger straight thru mufflers like mention in an earlier post but I think they went a bit larger and it's deff loud!

A crossover will really pull some snap out of loud mufflers.

I run 3" Ultra Flows with no cross over and dumps at the axle on my 79 Camaro with a pretty hot Tunnel Rammed 427 SBC. Its pretty loud. I did run 3" bullets before with a 406 I had in it and that was way beyond what I would consider acceptable as far as noise goes, didn't care much for the tone either. So one morning when I woke up at 4 am wondering what the f*%$k am I going to do now, I figures why not try the bullets in front of the Ultra Flows, so I welded them up and it actually tones it down a bit, as a nice aggressive idle still but less of a cackle to it. On the highway it's pretty quiet till you put your foot in it. I also like the fact that there is no comprise in back pressure with this set up. This is purely a street car.

The Sonic Turbos were basically now what we call the Dynomax Super Turbos, with both using a noise or energy cancelling bulge, at the end of the intake tube of the mufflers. Both of these mufflers will get a little louder with time/running them over months. Don't forget the Walker Quiet-Flow mufflers, which can have an even longer case than their Dynomax Super Turbos.

For both noise control and increased flow, if someone has room, then more that 2 mufflers can be used in parallel.

I recently installed the inserts in the exhaust tips. I didn't expect a lot but they did reduce sound end drone. Only drawback is that at idle it produces this kinda plopping sound, like it's loose, which it is not.

There was a slight drop in power across the board as I had to retune my efi. But only a couple % so not to bad.