Thread: Parts list for 99 Grand Prix N/A Header upgrade.

My brother in law just picked this car up with 200,000 miles on it. Even up here in the north east this car is still in great over all shape with virtually no rust. So I told him if he wants to restore some stuff on it just let me know and I'll do the mods for free. No sooner the I said that, the flex pipe blew a giant hole in it.....which of course is how I ended up here, and why I'm now looking for information about header installs...

So, I've decided on ether Speed Daddy or SSAC headers. Haven't decided yet to be honest. The only thing that scares me is how the flex pipe is attached to the header. I mean, did they really weld that thing on there???

We live in ma and will need to pass emissions testing. So I'm looking for a parts list assuming everything needed. I plan to put a hi-flow cat in, do they usually come with the o2 bung, or will need to drill that out and place my own universal bung? I would hate to delete it, as he doesn't have the money for a tuner or anything to delete the codes with.

Do these cars come with enough pipe to bolt right up to the cat-back, so that I can just cut out a section of the new pipe to place the high flow cat?

From my understanding of reading this forum the past few days I need:

-Header kit
-2 3" band type exhaust clamps
-2 2.25" band type exhaust clamps
-fel-pro head gaskets
-High-flow cat + clamps/adapter
-RTV Gold

Am I missing anything? Would you do anything differently? Were ordering tomorrow on somewhat short notice and the budget is between 3-400$.

-Thanks

THanks for the info fellas.

db what clamps did you use? I'm looking at these, it looks like I would need:

Dynomax 33231 Dynomax Strap Band Clamps x2

and

Dynomax 33272 Dynomax Strap Band Clamps x2

I think I'm going to have him just go catless for now and ignore the ses light until he needs to get an inspection. Then he can decide if he wants a sim+hollow cat or a $100 high flow Magnaflow w/o2 bung

Look at ZZP for a sim if you want, or just run the o2 sensor in with a spark plug non-fouler. But that looks like a good list minus the gaskets. Copper RTV is a good idea, and SSAC and Speeddaddy's are 100% identical just made by 2 different companies, and as far as we can tell there is no real quality difference.

The only thing that may be missing off of that list is bolts from the rear most header piece to the exaust mine were melted into solid pieces, and the circle gasket from the rear most piece to the cat back, mine was not included with the headers.