360 Headers on ebay for $2k?

They look very nice. Good luck!

What prevents me from going with an aftermarket header is that how do you know if these aftermarket headers perform any better than stock.

I don't know if I can believe the claims about more HP and Torque.

Didn't the CS used the same headers as the 360? Maybe Trev can comment.

The stock headers have a heat sheild so you might want to measure the temperature with your new ones to see if you need to do anything about this. I've heard that someone measured the temp and found that the aftermarket headers ran hotter.

Also, you may pull emissions errors.

 

I am also worried about the pre-cat problem.

I hope these will install smoothly and you can solve the pre-cat issue.

Please give us updates. I might get a pair. They look fantastic and well made.

You can take digital temp readings of your current headers after warm up and after a drive to compare with the new ones.

 

Yes they did, watching this thread intently, if these Agency headers are any good i'll be getting a set too!

Anyone ask the seller yet how much they weigh?

 

Im lucky I own a 99 Modena that no have a pre-cat. Please let us know how this bad boys perform and sound!!

 

Why not just bang the existing pre-cat out of the header, and save 2k ? You'd retain the stock look, heat shields, etc.

 

+1
take it to the best local muffler shop and have them to take those bastards out of the end of the collector! I think I saw a web site that are selling a upgrade collector but I can't remember where :-(
good luck.

 

Agency Power is a division of Vivid Racing, both are respected names in the aftermarket community.

I'm fairly experienced with their products as we distribute them, although we've never sold this specific part and I cannot vouch for it, they stand behind their products if you have problems.

Good luck.

 

Banging out the precat may help with that issue but it doesn't change the fact that they are made of crappy steel.

I guess there are a couple of options re the air injection system. Have the old injection pipes cut off the headers and welded onto the new ones (works especially well on the Tubi aftermarket headers), or delete the secondary air injection system and have the car's ECU reflashed with 1999 software.

AFAIK you will get errors unless you do one of these two things.

 

You can always re-install new Factory headers.

Fab-speed makes replacement headers with the air rail but no precats so I think you will pull CEL codes.

 

Correction- Fabspeed headers do not have the cold start-up air ports.

All the aftermarket headers look nicer but thats because they don't have the heat sheild.

Somehow I think the heat sheild does matter. Would be great to get some comparison heat measurements with stock and after market.

I also do not think that they are any real performance gains with the aftermarket headers until you get to 8,500 RPM.

 

Fabspeed headers DO have the air injection ports.

 

Thanks for the info duskybird!

I was going off the video on the Fabspeed webnsite where they say they Do Not have
the air ports. Obviously their web site is not up to date.

How does one know when the headers need replacing?!!!

 

I'm watching this thread closely. I'd appreciate someone posting the results of an install on these headers.

 

Please weigh them before you fit them!

 

Many aftermarket hearders are made of stainless steel. If these are, then they transfer heat a lot less that the stock pieces, so heat shiels "may" not be required.

 

Hey guys glad I came across this. These are headers we actually had made a few months ago and didn't have much interest in.

We made a few sets initially for the 360 and 430. Right now we don't have stock on the 360 headers for 6 weeks approximately.

You should see a gain of about 35hp on the dyno. I don't want this to come across as a sales post so if I can answer any questions I will.

 

Do you have any dyno runs 'before' and 'after' of evidence to back up such a claim? I don't wish to come across as negative but 35hp from just the headers seems optimistic without giving the public some much needed proof!

Please quantify this because if you can you'll sell a whole lot more!

-T

 

I'm sorry for being misleading, the F430 headers gain about 35hp, and the 360 headers about 15hp. Not bad though for gains over the stock headers.

 

Thanks for the clarification.

These are questions people (myself included) are interested in.

1. Do they save any weight?
2. Are they prone to cracking? Anyone tested them long term yet?
3. What about heat disserpation vs stock headers, how much hotter do they get considering there are no heat sheilds on yours? Any temp information available?

On the hp claims, are these flywheel or @ wheel figures?

Cheers,

-T