True dual exhaust

[Sycostang67]

What is your point? smaller more efficient engines require H pipes? What about LS engines? they are much larger than yotes.

OR are you saying Coyotes need back pressure? If so I hope you build the exhausts on all the cars I race against.

I took it to mean different engines, different sounds. A new 302 sounds nothing like an old 302. I noticed the other day that a new truck with a straight piped 5.0 sounds different than a straight piped Mustang with a 5.0. I guess the trucks have a different firing order. Honestly I thought the truck sounded better, didn’t seem quite as raspy as the mustang.

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[K4fxd]

I guess the trucks have a different firing order. Honestly I thought the truck sounded better, didn’t seem quite as raspy as the mustang.

The trucks have a Y pipe into a single muffler. One side is longer than the other and it cancels some of the raspy frequencies.

I agree the trucks with coyotes sound best.

 

[Geodudes550]

Exhaust Addicts did a few. They're raspy for sure and usually 118-120 db.

@1:24 “Needs an x-pipe”

 

[NightmareMoon]

The stock suitcase resonator has two straight pipes inside, they’re just preforated for the resonator/muffler effects but you can see straight through each side.

 

[Adam the Lighting Guy]

OP

Bruh, I got ya' covered.

 

[CarDad29]

The trucks do have a different firing order. Something about running cooler... should've read more into that as I'm curious now...

 

[Garfy]

Yep, old school muscle car sound.

For some reason, the OHV engines back then sounded better than today's DOHC engines and back then they didn't have resonators or cats (like my '71 Mach 1).

 

[2morrow]

Hi OP,

I run a true dual exhaust on my car. Long story short is that I kept breaking exhausts on track, I didn’t like the cookie cutter options available and I wanted a deeper tone devoid of all the high end rasp. (Coyotes tend to sound terrible especially at high RPM due to the 4V architecture and firing order).

I have 12” flow through resonators to delete the rasp tones and flow through Magnaflow mufflers.

When in normal street driving it is deep and mellow. When in the high RPM range it’s still throaty and not nearly as obnoxious as your run of the mill coyote.

I get a ton of compliments on the tone. Even today when I was at the track several non American car owners came over to talk about it.





Full transparency, I would consider wearing hearing protection under your helmet.

 

[stannypack]

Exhaust Addicts did a few. They're raspy for sure and usually 118-120 db.

Holy shit that sounds godly

 

[sloww5oh]

Hi OP,

I run a true dual exhaust on my car. Long story short is that I kept breaking exhausts on track, I didn’t like the cookie cutter options available and I wanted a deeper tone devoid of all the high end rasp. (Coyotes tend to sound terrible especially at high RPM due to the 4V architecture and firing order).

I have 12” flow through resonators to delete the rasp tones and flow through Magnaflow mufflers.

When in normal street driving it is deep and mellow. When in the high RPM range it’s still throaty and not nearly as obnoxious as your run of the mill coyote.

I get a ton of compliments on the tone. Even today when I was at the track several non American car owners came over to talk about it.





Full transparency, I would consider wearing hearing protection under your helmet.

sounds fantastic. Can you tell me the exact parts so I can buy them lol. My only concern is I have Catless headers so I already have that insane rasp from that regard….

 

[drive_55_not]

sounds fantastic. Can you tell me the exact parts so I can buy them lol. My only concern is I have Catless headers so I already have that insane rasp from that regard….

I have the Lethal/Kooks Catless LT's and am going to replace the OE suitcase with two 3in bullet resonators [ $68/pr off feeBay ] adapted down to 2.5in into 2.5in H-pipe I cut off my 3v exhaust and keeping the stock AVE mufflers

That should deepen the WOT tone and cutout the trumpeting in track mode.

I'll try and get it on Monday or Tuesday.

 

[stannypack]

I have the Lethal/Kooks Catless LT's and am going to replace the OE suitcase with two 3in bullet resonators [ $68/pr off feeBay ] adapted down to 2.5in into 2.5in H-pipe I cut off my 3v exhaust and keeping the stock AVE mufflers

That should deepen the WOT tone and cutout the trumpeting in track mode.

I'll try and get it on Monday or Tuesday.

That's pretty much what I did, added 2 vibrants in parallel at the H pipe and it doesn't sound too raspy. Ignore my friend screaming

 

[SCP440]

A lot of the old engines in the 70's had an exhaust crossover in the inlet manifold to speed up the warm up process to lower emissions. If you blocked this off it totally changed the sound these old engines made. Interestingly if you fit alloy heads to these old engines the exhaust crossover is omitted.

 

[2morrow]

sounds fantastic. Can you tell me the exact parts so I can buy them lol. My only concern is I have Catless headers so I already have that insane rasp from that regard….

Thanks man, I got a pair of 12” MBRP resonators and magnaflow mufflers P/N: 14419.

However if you have LTH’s I would recommend a 16” or 22” resonators to help tone that down.

 

[K4fxd]

A lot of the old engines in the 70's had an exhaust crossover in the inlet manifold to speed up the warm up process to lower emissions. If you blocked this off it totally changed the sound these old engines made. Interestingly if you fit alloy heads to these old engines the exhaust crossover is omitted.

It was for 2 things

1. Emissions, that was the EGR path.
2. Faster warm up, it got the carb warm faster so in colder climates it wouldn't ice on cold start.

It did not act as an exhaust crossover like an H pipe since it only used 2 cylinders for the crossover. All hot rodders blocked these HP killing passages.

As far as changing sound, I never noticed it. But I never remember anyone chasing sound back in the day, power only.

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