peterek

Hello

I ordered true dual exhaust with headers and magnaflow mufflers for my 81 Corvette, I'm removing cat ,
and here is a question should i go with X or H pipe, and where it should be installed ( closer to the headers or closer to mufflers)?

And what is an advantage and disadvantage of having X or H pipe?

Cant wait to install it on my baby!! So excited

Ganey

They both work, X has a different sound, so get one & install closer to headers. Advantage more efficient ex. & power. (Disadvantage extra cost.)

peterek

Where can I get them?muffler shop or some online store?

Ganey

Both.

peterek

so Magnaflow 10791 Tru - X Stainless Steel 2.5" Exhaust Pipe should work just fine on true dual exhaust from corvette central?

is it bolt on or i need to weld it

dburgjohn

I had a 'X' put on mine with Magnaflow mufflers and Flowtech long tube headers. Sound is really good and the X took the harsh part of sound while staying deep sounding.

Ganey

We have a dual ex. crossmember up to 79.
You need duals for 80-81. Someone did a great job on 80 or 81 & posted pics.

pippo350

On my '81 I have the entire sistem(SS) from Pypes with X and it sound good. no drone in the cab.

Imo Apita

H-pipe will be made by the exhaust shop and X- pipes can be bought from different sources.
You can get all fancy and scientific with $300 X-pipes from Dr.Gas or $30 E-bay versions.
I've got my eye on a 3' X from an E-bay store.

MN80Vette

If you are referring to my '80 true dual with modified front cross member, then thanks!

Here is one of the threads where I explained the simple cross member mod:

My '80 true dual explanation with pics.

I will be building a new mandrel bent true dual exhaust system soon though. My Keisler 5-spd transmission kit comes with a new cross member and my exhaust system was specifically fit to the cross member. A friend bought my complete exhaust system and cross member for his '81.

gregmuzila

i thought true dual is going from headers straight to exhaust to mufflers.

no crossing at all. am i wrong? the true dual kit im buying from Hookers is like this, with no crossing


like this one...

http://www.summitracing.com/parts/HO...1HKR/?rtype=10

tekvette

X pipe will work better than an h pipe. Both will increase torque.

Ganey

Yes, that looks like it.

The H is called a balance pipe- it’s added to duals as an improvement so it’s (true) duals w/ or w/o.

Ganey
http://www.corvettefaq.com/c3/ganeyexhaust.htm

gregmuzila

I wonder how difficult it would be to put this H into the Hooker exhaust setup I want to get. Not sure what to do. I see they sell an H pipe, but I will have to call and see if it is compatible

Dodosmike

I just had Hooker headers installed and a shop-made mandel bent true dual set-up installed. 2.5" from the headers back. No x or H or cats, with Flowmaster mufflers.

No drone at all.

Just need to tune the carb now, wont idle at a stop without bumping it into neutral and feathering the gas. I assume its a simple adjustment, but just don't have the time to ***** with it.

dodosmike

gregmuzila

See this is all soo confusing.

I talked to Hookers, Magnaflow and Flowmasters all today.

Hookers said you don't need X or H pipes unless you are a DYNO nerd and whatnot, Magnaflow said same thing, but suggested an H pipe for older muscle cars like the Vette to give it a dark toned growl.

Flowmasters tech support was the nicest out of them all. I will probably get a flowmaster super 40 setup in mine. He said he recommends an H pipe to get a little more HP out of the setup and to help balance the high pitches between each side of the engine.

I am having a hard time finding a 2.5" exhaust with an H pipe though. Hookers has a setup, but only 2.25" and no H or X.

And then after all this I have no clue if i want to pay extra for ceramic coating on the Headers to reduce all the heat.

Ganey

Yes they sell them though a shop might add one for less.
http://www.jegs.com/p/Flowmaster/Flo...44757/10002/-1

Dodosmike

No idea what year of car your putting the parts on. But one question is how much do you want to spend for a car you only drive "X miles or x months a year?"

Mine only gets 3000miles a yr MAX. Small baby at home so little time to cruise.

I was debating on ceramic as well...for the cost increase, I couldn't justify it. Hookers worked for me because i could get them around my steeroids R&P steering setup with modding (BFH) the tubes. Fit like a glove, a tight glove (like OJ Simpson tight) but it did fit!

Exhaust shop bent me up some 2.5" tubes and welded most of it except for just near the cross member (forget if just behind or in front) is clamped incase I need to take it off someday (4spd auto swap in the future). No x or h. And I couldn't see where ya could put a x without it being so damn low it might hit the ground. H would go in easier, just aft of the ebrake equalized thingy, whatever its called.

Flowmaster has LOTS of sound clips on the website, which the Tech guy there told me sound NOTHING like what the car/truck is going to sound like in real world situations. I'd agree, I had a 40series on my last pick-up ('06 5.3 Silverado), was WAY TO F'N LOUD. I hated it. Droned bad. Was going to swap the muffler to something else, but "knocked up" (#1) the wife and needed a 4 door truck, so I traded it on a Ford F150.

I didnt notice ANY power improvements (...yet, carb needs tuned and engine needs timed). Runs the same temp (hot) inside the cabin as before.

Hope that helps ya out.

dodosmike

gregmuzila

Well I am wanting the Flowmaster Super 44s mufflers.

Hoping to buy a Corvette Central 2.5in exhaust kit (but it comes with stock mufflers, trying to get them to sell it without or I will sell the exhausts online)

Won't do any cross-pipes. Still debating about the ceramic coatings though

Mark Hawkins

will you be eliminating the oxygen sensor with the headers?