BizZzatch350

iTrader: (33)

Keep in mind if you decided to do shorties on a 93, the emissions hook ups are different than the 94+ cars.

JOHNNYMO

iTrader: (1)

So LT's or mid length will bolt up, but not shorties?
thx

BizZzatch350

iTrader: (33)

They'll all bolt up fine, but if any have emissions hook ups they need to be specific for a 93.

JOHNNYMO

iTrader: (1)

The only emissions provisions I have are the pipes that rise up off the manifolds to the diverter valves which are plumbed in conjunction with the air injection pump, and of course the o2 sensor bungs, but thats it.

All the headers Ive looked at have those provisions as well as some having the small tube that comes from the header that looks like this> (o0o) From what I can tell those ones can be blocked off with a block off plate.

hrcslam

You mean the EGR?

JOHNNYMO

iTrader: (1)

No. Look at the headers you posted in this thread. See the little tube with the flange on it? Not the straight riser tubes...the little ones. Those I dont have.

*****Ok, so on a second look, it looks like theres only one of the smaller tubes on the passenger side header...which I still do not have on my 93 Z.*** Im guessing the 94 and up LT1's have something that fits there????

sleeperLT1Z28

iTrader: (1)

93's have a unique EGR/AIR combo pipe. The passenger side manifold has a single bung toward the rear of the engine. The EGR/AIR pipe threads into that. It feeds the EGR and also has an air injection check valve. The 94 and later cars have a seperate EGR feed on the cylinder #8 exhaust manifold runner (at the rear of the engine) and an air injection port on the #2 runner (at the front of the engine).

It's easy to use 94 emissions headers though. You simply need to buy a 94 EGR feed tube from GM. This goes from the flange on the #8 header tube to the back of the intake manifold. You then need a 94 air injection pipe and check valve to go into the bung on the #2 header tube. 93 and 94 use the same location for the driver side air injection port (#1 header tube). Last, you'll need some extra air injection hose and T-fitting to connect both air injection check valves to the air pump. I ran the hose around the back of the intake on my car.

JOHNNYMO

iTrader: (1)

.........

hrcslam

The small EGR for 94-95 is located on the #8 cylinder. I don't think your local exhaust shop will have any issues welding what ever you need to your headers to make them emissions compliant. It should be an easy $20-30 for them.

nitrous2fast

iTrader: (2)

To help with the heated o2's that are moved down stream ive taken header wrap and wrapped the section with the sensor before and after a few inches; also take a small portion and wrap the sensor itself... don't know if it helps enough for the cost of wrapping but...

JOHNNYMO

iTrader: (1)

I dont find one single set of long tubes with the correct ports for emissions with the exception of shortys... Im probably gonna go with the shortys.... I want the sound to be better and if I pick up a few extra ponies, then fine...if not, I guess thats ok too...

hrcslam

You will gain power with the shorties over stock manifolds. Anyone who says otherwise is ignorant and should be ignored. Long tubes will do a little better for sure, and really show if you do a head cam swap (10-20hp, leaning towards 10). But it should hardly be the determining factor on which headers to buy, especially on a street driven car.

Personally I was shooting for mid-lengths on my build. Pace setter makes some 1-5/8" mid's that would've worked for me for right around $300. But, I found some ceramic coated LT's locally for $200, add $140 for the Y-pipe and I was $40 more for a ceramic coated LT set up. I jumped on it. If that deal didn't arise, I'd be running mid's right now and enjoying the extra ground clearance at the sacrifice of 5-10 hp or so.

sleeperLT1Z28

iTrader: (1)

The other option you have is to only run EGR and eliminate the air injection all together. That way you'll only have to install a 94 EGR feed tube. No ECM tuning would be necessary either, as long as you leave the fuse and relay for the air pump installed. It would clean up the engine bay too.

-PEPE-

iTrader: (10)

This is good advice given, nice to see someone post realistic estimated gains for someone with minor engine mods. In my LTxx days I never saw anyone lose power with shorty's but as many have stated and already know, they aren't worth the cost/labor vs mids or longs.

Almonz T/A

LT's everyday of the week and twice on Sundays

JOHNNYMO

iTrader: (1)

So why couldnt I simply remove the riser pipe from the passenger side #2 cylinder, seal the hole with weld or weld a small plate over the hole...then drill a hole in the #8 tube, and simply weld the riser in that spot? Of course Id need to cut off and weld the EGR small tube closed also. The driver side is actually ok and doesnt look like it would need any modification. This way I could use LT's for a 94& up.

JOHNNYMO

iTrader: (1)

So, does this sound like it will work?

hrcslam

That should work, and shouldn't cost much either. Every Exhaust shop I go to for quick easy access welds only charge me $20-30. The most I paid was $50 to install my Magnaflow cat back I found on craigslist where he needed to weld in the over axle pipe to the I pipe and new hangars to the Magnaflow.

If you take them both the headers and your stock manifolds and show them what you need, I see no reason they couldn't do it cheap and fast with the pipes not in the car....

If you're in Colorado Springs, there's and exhaust shop called Muffler Masters on Austin Bluffs that my Brother used for his Camaro. Good prices and people, but that was back in 2009. I'm going to assume you're in Denver area though as you need the emissions crap and that's the only place in Colorado that requires it.

JOHNNYMO

iTrader: (1)

Actually Im in Canon City which is where the Royal Gorge bridge resides... No emissions here, but I really want to keep everything as close to stock "looking" as possible. Also, I will do the welding myself. I have a Miller mig and it shouldnt be too hard. Thanks for the input!

hrcslam

Ohh sweet. That makes things even cheaper. LOL. I lived in Colorado Springs from 2002-2006 then again in 2008-2010, Never made it to Pikes peak, Canon City, or Cripple creak. One day when I'm visiting I'll do it.

Let us know how it goes.