Just wanted to send a big thanks out to Dyno Don, we just installed our new headers and y-pipe he built for us, and the fitment was excellent.

A few of the headers bolts are tight to the tubes, and you think you may not get them in, (this comes along with any large tube header install)but always start with the tightest bolts first, and use the small 5/16" headed bolts he recommends, along with the recommended Earls gaskets. Both headers and y-pipe are excellent fit on our 1986 Trans Am with factory style motor mounts and factoy oil pan, went right in with no problems at all.

Thanks Don, I appreciate it!

Brian

 

Looks good. Im thinking of getting some Dyno Don Headers myself.

How is the FITech unit working for you?
Is that a RPM airgap intake?

 

Thanks bluegrassz, the Fitech system is working fantastic for us so far, we haven't driven it much yet, but the little that we have, it runs circles around the blowthrough CSU carb that was previously on it. Cold and hot starts are way better, and driveability seems to be excellent so far, as one would expect with EFI. It was super easy to install.

That is indeed an RPM Airgap intake, we did have a Victor Jr. on it, because everybody says to run a single plain with boost, but it lacked low end throttle response , atleast it did with the carb on it, so we replaced it with this airgap intake, because in my opinion, a dual plane is way better for the street ,it produces better low end response, doesn't make the car feel as sluggish at low speed, part throttle situations. The RPM airgap is an excellent design, so distribution isn't such a problem for a street car, with street boost levels., like the old dual planes used to be. Even the owner of Vortec Superchargers says he favors the dual plane on a street application up to 15 lbs of boost, over that, go with a single plain.

 

I had seen read where a "self Learning EFI system" not sure which brand had trouble with a Dual Plane. Something about some of the cylinders going lean. They switched to a Single and it helped. That was NA though. I am running a Air Gap and was curious how it worked. Sounds good.

 

Any updates on how the FITech is working out? Never heard of any cylinders going lean....you'd think that would happen with a carb too since it mounts in the same location.

As far as Dyno Don's headers go, mine fit pretty much without a hitch, but the Y-pipe didn't. BUT - I wasn't running a stock oil pan which is what the y pipe is designed for. I still don't have a stock pan, but a Canton road race pan. It fits, but it's tight!

 

I'm contemplating buying Dons header and Ypipe assembly for a 91 dual cat car but I'm confused on why there is two different ypipes. Yes, I understand the dual cat and single cat cars but there isn't even cats on either of his designs so why the need for two different kinds?
I plan on buying the intermediate pipe from TDS so what ypipe should I go with that will be easier to install?

 

The "Y" pipe on the single cat system is a "2 in, 1 out" pipe and is actually a "Y".
The dual cat system is actually two independent pipes from one header to one cat... x2. "1 in, 1 out" x2. So not actually a "Y", but called a "Y pipe" as the generic term for "pipes between header(s) and cat(s)".

If you want to run a single cat, get the single cat "Y".
If you have, or want to run dual cats, get the dual cat pipes. You will need a "Y" after the dual cats, or run "true duals" from thence back.

 

Maybe this will help...

 

I was under the impression that both of these Y pipes eliminated the cat(s). If they are designed to use catalytic converters then that clears my confusion up now.

Don, is there an option to have a ypipe made that eliminates the cats and bolts directly to the intermediate pipe?

 

Sorry, no there isn't.

 

So Dyno Don are all your headers shorty's? Im looking for an exhaust for an 89 Iroc Im putting together. It has a 500hp vortec 406 with a FiTech F.I. set up. A/C, The car is dropped 1" with a Pro Kit and would like to go a little lower. It has a Canton road race pan on it and frame connectors and as it is a street car I dont want it too loud it will need cats. What can you do for me? Thanks

 

Looking for a set of 1"7/8 long headers,anyone know if Dyno Don makes any.I tried a Google search for a web site,but my security has a warning on page.

 

Does anyone have contact info for Dyno Don?

 

Send him a PM if you haven't already, he is quick to respond usually

 

N/M

 

Love to take something operating over need a surgery to be reliable.
What all do you do don, tuning general repair or? Whats a good time to call?

 

Another BIG SHOUT OUT to Dyno Don headers for helping me get my Hawk into the 11’s. These headers fit awesome and the finish is super durable. Thank you!