They are GM part #'s 14094063 and 14094064. Has anyone tried them? Do they fit like stock under the hood? At $110 each are they worth it? Thanks for any thoughts

 

They came on the TPI cars. They have a 2 1/4 outlet. I have a set for sale if you're interested.

Theres another set that are stainless. They came on TPI equipped Vettes- have a center outlet, and won't fit on a 3rd gen.

------------------
Mike L.

The Weapon of Choice:
1987 IROC Z 5.7 TPI A4 3.27 Borg-Warner four wheel disc
Mods: 2300-2500 Stall Converter, Shift Kit(GM parts), TPI Specialties Stage 3 PROM, Modified Airbox w/ K&N's, homemade cold air, Relocated MAT sensor, Gutted MAF, 160* thermostat, MSD 6A, Accel 8mm Wires, bypassed TB coolant, Flowmaster 3 chamber single 3" in/out muffler, 3" MAC mandrel intermediate, custom dual !cat Y-pipe. airfoil, ported plenum. !smog, few others I forgot...???

**BOYCOTT LAPEER DRAGWAY**

 

Why buy exhaust manis for that kind of money? Just get a set of headers, they're not much more and are wayyy better.

------------------
Ray87Z
-Vortec headed 350.
86 IROC w/ a cammed 305 TPI.
Formerly Ray86IROC.
www.inter-scape.com/Ray

 

Those are the same exhaust manifolds that came on 350 TPI cars. I'm sure you can find someone who will give you a set, or sell you a set, cheaply.

------------------
1991 Camaro Z28
5.7L 5-Speed (originally 305)
317 RWHP, 418 RWTQ
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Member: SoCal F-Bodies
-=ICON Motorsports=-

 

I just swapped some of those manifolds on temporarily while i wait for my headers. They are most definitely a larger piece and have an ~ 1/2" bigger outlet to them. I put dual cats on at the same time, and the swap from the TBI style small outlet manifolds/2.25" cat made a noticeable difference in every phase of driving. If you don;t want to fight with headers these are defnitely a worthy upgrade from the small manifolds, and if you leave teh AIR tubes off 'em, plug access is a breeze. Keep in mind you will have to swap to one of the TPI Y pipes, either the single 3" or a dual cat set up, the dual cats being decidedly better due to the real Y after the cats vs a T for the 3" set up.

edit, i forgot to add that as the others said, these manifolds are plentiful and cheap, i wouldn't pay more than $20-50 for a pair. These things are alwyas in the classifieds here for that much. If you ask around you'll be surprised who has a set laying around, i got mine for free as they were sitting on a guys garage floor just wasting space.

...ed

[This message has been edited by Ed Maher (edited August 27, 2001).]

 

Just picked up a set of these manifolds to replace the tiny ones on my lg4. Did the cars these came on have a heat riser on the pass side? And can someone point me to someone who has the factory y-pipe to go with these manifolds. I'll be replacing the cat also.