Exhaust too loud

[cst350]

Got a visit from the local Code enforcement. Actually a pretty cool guy. We talked for @ an hour about the good days at Fremont Raceway a cruising in San Mateo in the 80's. Problem is I seem to have racked up quite a few complaints from my neighbors. All started when I put a QA-1 rear suspension on my 69 and had to cut off the tail pipes before the axle. There doesnt seem to be any way of getting past the panhard bars. Currently I have Hedman 3/4 headers to 2.5" tubing. Crossover and Spintec 300XLP (which have a 16" case) and turn downs right before the axles angled 45 deg.

Soooo... I am thinking of trying to get the quietest and largest mufflers (high quality) I can fit.

From my reading I have it down to

Dynomax Super Turbo 17749- 25" long (20" case)

Magnaflow 12577 - 28" long - 22" case

Anyone have any experience with these? The Dynomax is shorter so it might be better for install.

[72c20customcamper]

Since when can code enforcement officers be used for a V&T compliant ? I can see your generator or using impact tools at odd hours but your car should have been a police officer and they can’t go by someone complaining they actually need to see or hear an offense

[72c20customcamper]

NY went on a blitz last year on loud exhaust violations on motorcycles ,cars and trucks . They issued 100s of tickets in a short time . Problem was they all got tossed because the violation requires the use of a decibel meter placed a certain number of feet from the car and then the car is to be revved to 2000 rpm and the reading taken . No police cars have the equipment in them requires two police officers and the owners permission for one officer to be in the car /truck or on the motorcycle applying the throttle . Ya that’s gunna happen the judge who decided the case tossed every summons and revoked any that people plead guilty to or convicted of . The judge also ruled that excessive noise cannot be at the police officers discretion as to if the exhaust was too loud

[72c20customcamper]

I had Pypes race pro mufflers on my Chevelle took them off because they were super quiet called Pypes and they confirmed that they were in fact quieter than the street pro muffler but still had great flow characteristics but were quiet because of track restrictions on noise . I replaced them with the street pros not loud at low throttle but has a nice tone when punching the gas . I do have electric cutouts for when the time dictates it.

[cst350]

72C20customcamper: Yeah, he couldn't give me a ticket.

Fact is, my son built the engine and I let him pick the exhaust too. In my 20's I would have loved it... in all honesty It's pretty damn loud!

I'll look into the Pypes mufflers

Anyone else have a recommendation?

[LS short box]

I have a 98 Wrangler with a LS6/4L60E swap. I'm running the large length wise 3" Dyno Max turbo muffler listed above. Nice rumble but not loud. Zero drone at speed.
Don't know if it works for you but I typically build my exhaust from tubing from the local muffler guy and boxes of bends from summit.

[jerry moss]

one of my former coworkers has a 71 3/4 ton 2wd, looks like a basic grandpa truck right down to the stock rims. under the hood was a different story altogether, a pumped 502 with 3" duals, he wanted it louder than his 10 series flowmasters so i ordered him a set of wicked flow mufflers and turned the tailpipes out in front of the rear tires with 4" gun sight tips. it was LOUD but the neighborhood where he lives has an HOA so every time he fired it up his neighbors would file a complaint so i had to tone it down just a little. gotta love living in that type of neighborhood.
i would go with the dynomax and if possible put tailpipes out the side or at least angle the turndowns toward the outside of the truck to help cut down on the resonance noise.

[KQQL IT]

I have a pair of 70 series under my 73 - rowdy sbc 300° roller cam 10-1 compression.
And nobody complains

[Accelo]

Interestingly, the HOA had the power to do something that the police didn't.
I don't have an issue with being reasonably loud during the daytime.
The issue is the idiots that go by at 2 am in their vehicles getting on and off the throttle.
Or the diesels that don't have anything past the turbo.
I like to sleep with the window up.
Frankly, I like to sleep at night.

When I used to consult and stayed at a hotel near a fish processing plant.
The shift got off at 2:30 am. A guy on a two-stroke powered skateboard left work every night with this board.
I don't believe it even had a muffler on it, crazy loud. I bet he woke up several hundred people every night there on Hotel Row.
This went on until I emailed every single person on the Newport City council one night. Finally ended after that.

I don't know what happened to Reasonable.

[truckster]

I have Magnaflow 16" straight-through mufflers. Nice sound but not excessively loud.

[custom10nut]

Why do you still live in one of the Communist States.
Their aim is to rid the roads of all Internal Combustion Engine powered vehicles, and they’re concentrating on the “Old” ones, in the name of “Public Safety” (Kinda like the Covid Circus Lie).

[KQQL IT]

Originally Posted by custom10nut

Why do you still live in one of the Communist States.
Their aim is to rid the roads of all Internal Combustion Engine powered vehicles, and they’re concentrating on the “Old” ones, in the name of “Public Safety” (Kinda like the Covid Circus Lie).

Yeah and you can drive your hot rods 10 months a year. Until they ban us, I'm ok here

[72c20customcamper]

I just installed the blueprint 350 with Headman shorty headers . Hooked up to Magnaflow street series x pipe exhaust . And it’s really quiet at idle and with a few blips of the throttle. Haven actually driven as of yet hope to next week . Much quieter than than the generic glass packs that were on the truck .

Been to North California really liked it . Southern not so much

[Already Gone]

I have the Dynomax Super Turbos 17747's, a little shorter than the 17749's, and had them installed in 2015 just after I bought the truck. Truck had the stock 350 4 bbl. and I used 2 1/4 pipes, with an H Pipe all the way to the back exiting behind the rear tires and nice sound and sounds better when u walk on it. Have done an engine swap, 400 SBC with a .030 bore, since and still using the same exhaust system with ram horn manifolds.

[chevmn]

Just one of many reasons I no longer live within city limits, and now live where the closest neighbor is nearly a mile away. I was able to test and tune my big block truck with headers open and not a complaint. Sooner or later they are coming, small farms are being sold off and splitting up to build. But so far no codes or inspections here, so I have some freedoms. I lived for 25 years in a small town, and it was always something (loud exhaust, lawnmower blew grass onto the street, or I parked on the grass). Don't know how I tolerated it.

[Rambler62]

Check into Car Chemistry exhaust tubes. No traditional muffler. they go inside exhaust pipe. I have them on my 70 GMC stepside with LS motor and very happy.

[70cst]

I have factory exhaust with a pair of Spintech Sportsman Street 3000 with no complaints - then again I live in the country.

[72c20customcamper]

Originally Posted by Rambler62

Check into Car Chemistry exhaust tubes. No traditional muffler. they go inside exhaust pipe. I have them on my 70 GMC stepside with LS motor and very happy.

Looks like a nice easy solution. Never even knew they existed actually look a lot like the baffles on my Harley pipes

[67swb72klb]

Guess they never heard the term
loud pipes save lives..

[70cst]

This is what I have on the Circuit Rider ... a 402BB
SpinTech Sportsman Street 3000XL Series


This muffler has a mellow, a deep, throaty yet not annoying at cruising speed.

Well pleased

[RichardJ]

From the OP:
>>and had to cut off the tail pipes before the axle. There doesn't seem to be any way of getting past the panhard bars.<<

My suggestion would be to figure out a way to get the pipes out the back. Replacement mufflers with no tail pipe are probably going to be just as loud, unless you get some that are very restrictive.

I went the opposite way. I got chambered mufflers, that I was concerned might be too loud. Mufflers that I had used on another vehicle. I ended up a system that was quieter that I anticipated and desired.
I'm confident that replacing the tail pipes with pipes of a larger diameter will give me what I really had expected.
The diameter and length of the tail pipes make a big difference on any application, more so than the actual muffler selection..

[72SB]

OP, a muffler shop should be able to fab up OTA pipes. That will reduce noise considerably for Karen.

[LS short box]

Not a great pic but I was able to get 2.5" tail pipes past the panhard rod. I used mandrel bends from Summit. My 68 C10 had a 6" drop in the back.
Did the same on a 67 Nova with Heidt 4 link conversion with a panhard bar.

[HalfBrit]

First time seeing those reinforcement bars above the rear axle. Is that an add on?

[LS short box]

Yeah they are an add in. I copied them from article I saw in Hot Rod magazine. Guy was building a 67-68? C10 for some road course running. Truck was red. I don't recall the month or the year. Maybe ten years ago? I welded them in. The two bolts are for the exhaust hangers.