lsfanatic

I want to put long tube headers and a catless x-pipe on my C5 this winter. I had been looking at the kooks 1-7/8" race header with the catless 3"x3" x-pipe they have. Seems to be a good blend of performance, quality, and price.

However Texas speed has a 1-3/4" setup for the C5 that comes with an x-pipe and is considerably cheaper. How much is the 1-3/4" primary going to restrict things? I plan on doing heads/cam within the next year and I don't want the headers as a choking point.

As for the kooks setup, it looks like their primary O2 bung is located at the collector but only in the flow of one primary. Has anyone run into issues with it not reading from all cylinders?

Kooks also makes a 2" primary setup, which seems like it would hurt the low and mid range power, but how much? I am considering eventually supercharging the car and going close to 1000 hp, but would 1-7/8" suffice in that application also?

Thanks for any input. I feel like the more I research about it, the more confused I get.

scotty2000ss

iTrader: (2)

Based on your goals I wouldn't consider 1 3/4". Have you considered ARH? If it were me I would look into these

http://www.customcorvetteaccessories...iyheaders.html

lsfanatic

That's the thing, if I got 1-3/4" now I would have to buy different headers eventually. Which in my mind negates any cost savings seen by buying cheaper headers now.

I have seen those. I like them, but holy $$$.

scotty2000ss

iTrader: (2)

How much is the total cost for the Kooks set up?

BMR Sales2

iTrader: (40)

I personally have the Kooks 1-7/8" race header with the catless 3"x3" x-pipe on my 03 C5 Z06 and they had great fitment and made very good power. I have never had any kind of issues with 02s on my car and haven't really seen it be an issue. Unless you are building some crazy setup I would stick withe 1 3/4 or 1 7/8 primary headers. I would personally go with the 1 7/8 as it will give you room to grow and won't really effect the bottom end torque.

lsfanatic

About 1300-1400 from MD Speed.
Thanks for the input. Does the 3"x3" x-pipe have a 3" flange at the end or does it end in a 3" pipe?

MonmouthCtyLS7

iTrader: (6)

Monza EBay setup ftw, 1 7/8th Headers and ORX at a 1/4 of the price.

lsfanatic

Is the ID of the pipe true 1-7/8"? And do they fit on the car without hammering it into submission?

MonmouthCtyLS7

iTrader: (6)

Yes they're 1 7/8ths. I had a local experienced C5 guy do the install and he was surprised on how good the fitment was. He said the install went very smooth.

scotty2000ss

iTrader: (2)

Any numbers after the install? Do they have a merge collector?

MonmouthCtyLS7

iTrader: (6)

Yes its a merge collector, no numbers the car was street tuned.

Toddoky

Tubing size specifications are related to the O.D., not the I.D. like pipe is, which means the actual I.D. of a tube is dependent on the wall thickness of the material...thinner gauge tubing has a larger I.D. than thicker gauge tubing does.

BMR Sales2

iTrader: (40)

My X-pipe has the flanges on the back side of it.

lsfanatic

Interesting...
Not really sure what I was thinking when posting that, of course!
Okay, thanks.

Any one have any info has to whether the Pfadt/AFE headers really make more power (peak or under the curve) then a traditional 4 into 1 header? In theory they should, but its pretty expensive premium if there isn't much advantage.

scotty2000ss

iTrader: (2)

Take a look at this.

https://ls1tech.com/forums/generatio...eaders-10.html

lsfanatic

Hmm...read the whole thread, sounds promising. 352/368 rear wheel hp/tq seems really good for headers and a CAI. Curious what it does with heads/cam. The question though is whether or not the extra cost is worth the extra power.

scotty2000ss

iTrader: (2)

To me, it's totally worth it in the end. All the "little" things matter when making a combo work. If you paired HCI with those headers the results are going to blow away anything else based on how they work. Just my .02

farmington

iTrader: (14)

don't go only by dyno numbers. some "happy" dynos give very high readings.

MonmouthCtyLS7

iTrader: (6)

That's why I personally couldn't justify spending $1500 for a Header/Xpipe setup. Mine cost around $500 all together. It added some good power, along with being 1 7/8 & stainless steel. Some things you cant go cheaper on but imo exhaust is one that you can. Big difference in Ebay exhaust systems 10 years ago .and today.

scotty2000ss

iTrader: (2)

Look at the torque curve in that thread that I linked. No cheap Ebay header is going to give you results like that. You get what you pay for. The op mentioned some big plans. Exhaust will play a huge role no matter what the combo is.