Noticed that the Hedman Shorty Camaro headers have AIR and O2 fittings and 1+5/8 and are 50-state-legal.

But, the ceramic coated Hooker Comp's (accding to Summit) "are not legal for use on pollution contolled vehicles) but also have AIR and O2 fittings.

Its like they are exactly the same exact for the ceramic and maybe some mild design aspects. But I don't understand why one is emissions legal and the other is not?


Any one w/ Hooker Comp pass emissions no prob??

 

I'm not sure which Comp headers you're looking at, but the Comp shorties (2460) normally come with the O2 sensor fitting but the A.I.R. tubes have to be special ordered.

The Hedmans you mention come with the y-pipe, and are close to the cost of similar Super Comp shorties (2055 - uncoated, anyway).

If the Comp shorties have the A.I.R. fittings, and you have a y-pipe fabricated to retain the factory cat location, you shouldn't have any problems getting them through emissions testing/inspection. The only reasons I can think not to go that route are: 1) the Super Comp shorties come with a CARB sticker welded to the #1 primary tube (makes the visual easier to pass); and 2) buying the Comp shorties and having an exhaust shop fabricate a y-pipe for you will cost more than buying the Super Comps that are complete and that you can install yourself.

I guess I can think of one other reason not to go with the Comps: That expensive y-pipe you have fabricated will probably be inferior in quality to the prefabricated Hooker y-pipe that comes with the Super Comps.

 

Once again you have enlightened me.

Thanks.

Did you by chance read my post about the LT4 cam? I know its a little off topic. But while we are on the general subject of emissions: I noticed that the LT4 intake did not have an EGR because the LT4 cam made it obsolete. So, the point I'm trying to make is that it SEEMS like anyone running a modified LT1 setup on a thirdgen may not have to worry about EGR (depending on if they would want a 203/210 duration cam).

 

The deciding factors will probably be: 1) Visual inspection. Unless you have LT4-like engine & emissions equipment, you aren't going to be able to argue your way out of a visual no-EGR fail. 2) The sophistication of the sniffer. Some have NOx sensors, others don't. If no visual and no NOx detection, then you can probably get by. If no visual and NOx detection, you might still pass. Hard to say. Good cat & A.I.R. probably required, though.

 

oh...I think I remember why I was not looking at the SuperComps.

Well at least the 2055: because they are only offered on thridgens up to 1990. I own a 1991, making me SOL. Not sure why exactly they would not work on 91-92.

 

I just got the hooker 2055's installed and i have a 92. I think the only problem is that u need a 3 in. cat.

 

Crap...I just got a high-flow cat installled a few months ago and I think it was a 2.5

Maybe it was 3 in and 2.5 out. I don't know...I'll have to get the calipers out and see.

Thanks alot by the way

 

I was deciding what header to get for my 91 RS. So the 2055's come with a Y pipe and it all bolts right up except you need a 3' in cat? thats not too bad, is there a reducer to get around this or just buy a new cat?

 

A top-notch exhaust system:

Hooker 2055 headers, direct-fit cat for '86-'90 TPI single-cat application, and cat-back for same application.

It will bolt together. No cutting/drilling/welding required. Only possible hitch is the cat support on the tranny tailshaft housing would need to be changed as well.

An adapter would most likely require you to cut the 2055 y-pipe - why would you want to do that to such a piece of art? It would also be more restrictive, and isn't that what you're trying to eliminate?

If budget requires you to cut corners some place, get the headers and direct-fit cat, and have your current cat-back adapted to it (but do NOT modify the cat!). Then, you can do the cat-back later when funds allow.