Small Single Exhaust!

[Teeth & Tires]

The mate to the Big Single Exhaust thread...

So I'm doing my half-*** resto on a 69 Barracuda with original, unmolested 318, stock heads and 2bbl carb. I'm liking the 2 into 1 "Y" pipe from Accurate and I want a standard, "quiet" muffler essentially following the factory setup.

The complete kit from Accurate uses a 1 7/8" pipe after the Y but they offer the option of a 2 1/4" outlet.

Would there be any benefit/advantage to the larger diameter or any potential drawbacks to using it?

My first thought is that even a standard muffler will flow better at 2 1/4" than a smaller diameter.

 

[66plyValiant]

better flow, probably better power range as well

 

[OldmanRick]

In my opinion no drawback at all using the larger pipe they offer, unless it's crazy money for the upgrade?

 

[Teeth & Tires]

$20 bucks for the Y assembly to exit in the larger diameter. Then I'd have the locals bend the rest of it with a standard muffler.

 

[MagicMan]

I have a single 2 1/4 on my dart with a 2 bbl 273 and love it.

 

[Teeth & Tires]

Is that with a standard type or performance muffler?

 

[Teeth & Tires]

..and what of that 1 7/8" pipe size? I assume Accurate is using it because that's what the factory used. So, is that the optimum all-purpose tube size for a stock 318? I worry that the crush-bends will choke down the exhaust even further.

 

[805moparkid]

we just got a LTD kit for the 69 M code cuda were doing a resto on, fits like a charm but was spendy at 1100 bucks! thats an m code for you though...

anyways i think the stock mani's are 2" or 2.25 so i would run dual (of those) into a single 3". just take it to a muffler shop and have him do it, be under 400 bucks. for the muffler just find one you like on summit or look around on here for sound bites.

 

[MagicMan]

Is that with a standard type or performance muffler?

Its a performance straight through muffler, kinda like a dynomax knock off.

 

[MoparDaddy]

2 1/4 straight pipe with no muffler would sound awesome!

 

[66plyValiant]

2 1/4 straight pipe with no muffler would sound awesome!

hard on valves with no back pressure, same with straight through mufflers like glass packs (cherry bombs)

 

[Teeth & Tires]

Just want to allow the stock mill to be as lively as it can be while operating in its mainstay low rpm range. 3" won't do anything for me there. I also don't want the car to sound more 'bad-***' than it actually is.

 

[forphorty]

hard on valves with no back pressure, same with straight through mufflers like glass packs (cherry bombs)

Sounds like an old wives tale to me.

 

[66plyValiant]

Sounds like an old wives tale to me.

not really, burned valves are comman without back pressure since then engine flows much greater volumes then it was made for; creating more heat

dont believe me take your exhaust off and go for a 2 hour drive and see how the engine works afterwards!