Black_Vette

I am in the process of installing my no emissions hooker long tubes. I would like to finish of my setup with an X or H pipe I dont want to use a Y pipe(whats better X or H).

I want true dual exhaust probably 2 1/2 inches in diameter from the 3 inch collector on the headers back, no cat no mufflers.

I would appreciate part numbers for an X or H pipe that would fit with good ground clearance and minimal modifications to stock Y pipe mounting locations ???

And your opinion on any long term effects on my motor from running minimal back pressure ???

Thanks

bogus

Well, I disagree with the no cats route. You will loose torque.

I would go with bullet cats on the tail of the headers, an x-pipe and then pipes out back.

The cats will help cut down on resonance, give the engine some back pressure and keep the air clean.

cv67

Magnaflow makes a real nice box type resonator with a built in "X". True duals alone will wake up your 350, but they still like a little backpressure.

mikey whipreck

you could check ebay for those magnaflow x pipes... they're available in a few different sizes and are reasonably priced.
I'm confused though, you said true duals, but then you metioned a ypipe?

severe-1

I am planing on doing this exact set up. Ran out of money now, but soon. This is saved in my Summit Garage.

Give me some feedback/suggestions...

X-Pipe

Flowmaster 50 Series Left

Flowmaster 50 Series Right

Qty 2 3 in. Reducer

Qty 4 Exhaust Tubing, 180 Degree, Mandrel Bend, 2 1/2 in.

Qty 3 Exhaust Tubing, Straight, 2 1/2 in. Diameter, 4 ft. Length,

Qty 2 Exhaust Clamp, Band Style

cv67

Nice stuff, severe. Make sure the Flos come with the dedicated mounting bracket. If the muffler is Corvette specific, it should. THe Delta Flo 50's do, but they are a little pricey.

65Z01

With a set of true duals behind FL headers you not lose torque due to low back pressure. Back pressure means HP is being used to push out ehxaust gasses. Any apparent loss of power is usually a matter of components chosen or tuning.

In David Vizard's book on SBCs there is a table showing from experience that an engine needs about 2.2cfm of flow for every hp at the crank, or 880cfm total for a 400chp engine. When flow drops much that number, due to back pressure (i.e. flow restriction), power is lost to pushing out exhaust gasses.

Your intended 2 1/2" dual system should flow up to around 1,100cfm total and so would support up to 500chp.

The exhaust port ledge on a set of D-port (or similar) heads will help to minimize any reversion.

Black_Vette

When I mentioned Y Pipe I stated that I didnt want a Y pipe set up I want a H or X pipe after my Headers and then straight pipe to the rear no cats no mufflers.

I just want to know what H or X pipe to use ???

cv67

No expert here, never seen the comparos on a dyno either, but I bet they are close. The H pretty much equalizes the two sides of the exhaust, the X seems like the two paths of exhaust flow would cause quite a bit of turbulence crashing into eachother. I would say choose one that fits nicely under your car and fits your budget.

Biff Buyer

I think h-pipes sound better. x-pipes are probabl better performance wise.

AZC4Guy

My system is quite noisy... (true dual) will h pipe quiet some of the "throb" down? Is this what people refer to as resonance? That deep feel-it-in-your bones sound?

AFogleman

I have an 86 with no cats X pipe to flowmasters.I love the sound and feel of this setup.It is loud though.And I definately gained power.Low and high.I'm not an engineer but I would think the more flow out the better. Correct me if I'm wrong

bill mcdonald

I had hedmans and true duals, no cats. it really woke the engine up.
my set up had the H pipe welded in. I picked up the whole exhuast from a forum member like 5 years ago. I had no input as to how it as built.

rumor I heard, an X pipe will give a slightly higher HP number and change the exhaust tone a bit. I would go fo an X pipe. which one? well back in the day the only one I knew of was from dr gas. looks like there is a few to choose from now, and most set ups I see now for sale are leaning towards X pipes.

bill mcdonald

resonance is that annoying tone you get when you are cruising at 70 mph, and you try to talk to the passenger, and they cant hear you. you cant hear yourself even.

bogus

Just a quick thanks to all of you with no cats for ****ing up the air we all have to share...

Performance nut

This is why CARB exists, irresponsible auto hobbiests.

ericcer

An X-pipe cuts the resonance down more than an H-pipe

joe3906

RacerX70CC

bogus

To a degree, that is correct... more accurately, that is what CARB sees as it's place in life today.

The real reason CARB was created to was to battle the unique air flow conditions of the LA Basin.

Thanks to the mountains that surround LA on 3 sides, the Pacific on the coast and it's prevailing winds, the nasties get trapped. There is no way around that problem... The only fix is to keep the air as clean as possible.

Even when the Santa Anas blow, the air gets stopped by the coastal breezes. As strong as the Santa Anas are, they are not strong enough to get the nasties out to sea.

That is Floridas advantage. Flat land with tropical trades. The gick has no chance to stick around.