exhaust change

[GJCAT427]

  5 yrs ago at Beaver Springs I had the pleasure of running my 56 427 powered  F100 down the strip There was a guy recording the parade of cars and trucks going down the strip. He made a video of the procession and actually  mentions my name in it. I got the vid and you can hear the sound of my 427 . The exhaust is a hand built SST system pipe mufflers and tail pipes that I built.  I don`t know if its posted some place but I got many comments on the sound.

[Stangman]

Funny everyones car sounds great. If it wasnt for the drone I would leave my flowmasters. But I do like that the Borla,,and Magnaflow look nice also.

[WerbyFord]

So thinking about new exhaust for my car. I have 3 inch flowmasters right now and I have run them at the track and taken them off and they dont really hold the car back much. That being said the drone is just to much. I would rather sacrifice alittle bit and be able to hear myself think. What is everybody running. I really need to hear the different sounds whether they are Borla, Magnaflow or whatever else is out there. I dont want to make up an exhaust and not like the sound.

Curious what your timeslips looked like thru the 3" Flowmasters vs open (and where they were opened ie how much pipe was still on there)

[Stangman]

I will look back in drag strip section

[Jb427]

Do you know what flowmasters you have on the car? what about adding dynamat or some other sound proofing? i'm running a head shielding like this mine was around 12mm thick https://www.dynamat.com/products/dynaliner/?tab=automotive it worked great keeping heat and sound down.

[cjshaker]

Curious what your timeslips looked like thru the 3" Flowmasters vs open (and where they were opened ie how much pipe was still on there)

Not Flowmasters, but just for comparison, on the last day of Drag Week 2017, I took the exhaust and air cleaner off on my last run and gained .5 in ET.
 2.5" system, but my guess is the air cleaner had as much to do with the gain as the exhaust.

[Stangman]

Curious what your timeslips looked like thru the 3" Flowmasters vs open (and where they were opened ie how much pipe was still on there)

Werby  at the time I was running between 11.11 and 11.20 opened up with drag radials.
The next time I went to the track I ran 11.40 back to back passes with my exhaust on. Now I have hooker super comp with a 3 inch X pipe. After the headers there is about 1.5 ft of pipe then the X pipe then another 1.5 ft of pipe then the 40 series flowmasters then over the hump tailpipes cut off when they straighten out to go to the back.

[Stangman]

Do you know what flowmasters you have on the car? what about adding dynamat or some other sound proofing? i'm running a head shielding like this mine was around 12mm thick https://www.dynamat.com/products/dynaliner/?tab=automotive it worked great keeping heat and sound down.

I do have dyna mat on the front and rear floor going to the back seat. I should have gone th the rear end which would have covered the mufflers. I have the original 40 series mufflers and I love the sound. If and it is an if I put a cage in the car I will finish off the dyna mat to under the rear seats and as far back as I can. It can only help.

[fryedaddy]

im getting ready to get rid of my 3 inch flowmasters,not happy with the sound.i have been using cherrybombs most of the time in the past 40 years on FEs.bar none i think cherrybombs sound better than any other muffler on a fe.always have,they are not too loud crusing,but when you step on it they blast out.they dont sound as good on a chevy or mopar as they do on a fe.not an opinion,just stating a fact.

[Jb427]

I was thinking of going 3 or 4 inch oval exhaust for my new system and side pipes out just infont of the back wheels got to see what muffles i can fit with that set up but that may get fitted and run once and taken off.

[cleandan]

I recently built a full under car exhaust for a 1967 Shelby Cobra 427 Roadster (street car trim)
2.25" pipes, all mandrel bends, full over axle and out the rear of the car.
The mufflers are SpinTech 6000 series.
The mufflers were custom made (stainless steel) to fit the limited space available, but not a lot different than their "stock" version.

The exhaust is surprisingly quiet while cruising, yet still has a great idle rumble, and barks well when getting on the gas.
Everyone who has heard the new system agrees it sounds very good.
Everyone who rides in the Cobra is astounded how quiet it is in the car when cruising.
The SS SpinTechs were $$$$$, due to being SS and a custom size, but I am sold on the build quality, performance, and sound when using a full exhaust system.

[Jb427]

I recently built a full under car exhaust for a 1967 Shelby Cobra 427 Roadster (street car trim)
2.25" pipes, all mandrel bends, full over axle and out the rear of the car.
The mufflers are SpinTech 6000 series.
The mufflers were custom made (stainless steel) to fit the limited space available, but not a lot different than their "stock" version.

The exhaust is surprisingly quiet while cruising, yet still has a great idle rumble, and barks well when getting on the gas.
Everyone who has heard the new system agrees it sounds very good.
Everyone who rides in the Cobra is astounded how quiet it is in the car when cruising.
The SS SpinTechs were $$$$$, due to being SS and a custom size, but I am sold on the build quality, performance, and sound when using a full exhaust system.

Got a web site for the custom mufflers? been trying to find a place that will make some.

[fryedaddy]

as far a hp goes straight thru designed mufflers will outperform chambered mufflers.i saw a heads up comparison on several name brand mufflers,some of the big names lost a few hp to the straight thru mufflers.not naming any names but they lost power