I have been running around with the dynatech long tubes and high flow cats for a week or so now. They make my magnaflow sound amazing at WOT.

Anyways I have been hearing an exhaust leak and today we put the truck on a lift to try and find it. All the seams are tight and no leaks are present at the pipe connnections. We sprayed some liquid on the back side of the left cat and its leaking at the cat itself? There seems to be a hole right where the heatshield is welded to the cat?

Anyone else have this problem?

Very odd deal, im taking to my muffler guy tommorro to see if he can repair it.

Bob

 

Go catless, brother!

joe

 

I agree. Magnaflows, Dynatechs, and high flow cats sound amazing at WOT.

I wouldn't get the current high flows fixed, I'm sure that they would be covered by a warranty.

I can't even imagine how loud it would be without highflow cats, I presonally wouldn't even try it. I'm not sure I've ever heard an L louder than mine. And I've been to the track a time or 2, plus a couple of NMRA world finals.

 

Took the truck to the muffler shop and the guy said the left cat had four holes in the seams where the ext pipe was welded on by dynatech.

I knew something was up because the truck was idleing 15.3 on the wideband and know its back at 14.6 - 14.7 where it should be. The leak was allowing air to flush back to the sensor as the exhaust pulsed back through the cat.

Intresting deal...I am going call dynatech and let them know about this, maybe there are more cats rolling around with leaks.

Bob

PS. There is no way in hell that I would run catless with this combo (long tubes + magnaflow) I like it loud but that would be ear damaging.....

 

Call Dynatech they will take care of you.

 

The shop did not charge me, I have been there alot over the years.

I am gonna call dynatech to just let them know they might have QC problem.

Bob

 

How was the install of these parts? Fairly easy? Would you do it again?

 

Install was OK, not as bad as I thought it would be, did it with help on my driveway on a Saturday.

Would definetly do it to my truck again.

 

Yes it was very easy....

Took us just about three hours, that was on lift though. Myself and a technician at the dealership I work at knocked it out one night after work. This was the second set of long tubes I have installed on a Lightning and there is alot of room so its really no big deal.

Bob

 

What all needs to be moved, just the inner fender wells? I have always heard that installation was a nightmare, and it made me not want them. But I have a car lift so that would make it easier. What are the pros and cons of these? Anything?

 

Here is genral play by play....Kooks and dynatech are very similar to install but the passenger side on the kooks is a little tighter. If I remember correctly you have to go in from the top on the passenger header with the kooks. The dynatechs are both installed from the bottom.

1. get the truck the left.
2. remove front wheels and fender liners. disconnect negative cable.
3. unbolt the cat back and remove.
4. remove O2 sensors.
5. drop cat mid pipe - your gonna have to sawzall or remove the trans crossmember to remove.
6. remove stock exh manifolds.
7. remove the upper studs in the heads, it makes it easier to put the headers in place.
8. bolt the headers in, install O2 extensions. I use the facotry studs wherever possible.
9. Install high flow cats. May need to cut heatshields with the kooks.
10. install cat back and recheck your work.
11. start the trcuk and check for exhaust leaks and make sure the O2 sensor wires are ot going to touch the exhaust anywhere.
12. reinstall fender liners and wheels.

Finnally have a beer and enjoy how brutal the truck sounds....

Im sure I skipped some the more obvious things but its not hard to do really. You want to try something hard install BBK long tubes without dropping the K-member on a 1996 Cobra. That Sucks.....

Bob

 

Thank you for the great reply.