I was looking through a Jegs magazine at the headers and found some shorties. they say that fabrication to the stock y-pipe is required to fit. I was wondering what things need to be done to the stock y-pipe to make these fit. Is it just a matter of replacing the 2-bolt stock flange with a 3-bolt flange? Sorry if this is a redundant question but I did a search and found nothing that really pertained to this. Thanks.

 

The following won't answer your question, but it may be food for thought: Why purchase headers, which are more free flowing than the OE manifolds, then bottle that flow with an OE Y? For the best performance, headers and matching Y is the best bet.

JamesC

 

Something else to keep in mind,I am not sure what you need to do to your pipe but I just modified my stock y-pipe and didn't realize until after I cut it that it is a double walled pipe from the drivers side manifold under the oil pan to the junction with the other manifold pipe.

 

what exactly is the difference between the stock y-pipe and a new one? Other than new metal and a three bolt flange. How much does it bottle it up, it looks like my Y-pipe is huge, so is a new one just a 1/4inch bigger or what?

 

Your OE Y may well be smaller than the outlet of the headers, thus restricting flow. Hooker 2055's, as an example, are 2.5 at the collector (IIRC, your OE set-up should be 2.25), then go mandrel bent to a full three inches, making it possible to run a three-inch in/out converter and a three-inch intermediate pipe. I believe your OE intermediate is 2.75--and nothing will be mandrel bent.

Anyway, you might take a peek at the stickies at the top of the page for more info, if you haven't. And perhaps another member will pipe in.

JamesC