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Old 08-25-2010, 08:52 PM   Thread Starter #1
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Default Headers vs High Flow Precats

Feel free to enter all facts about the products...

So the Racingline High Flow Pre-Cats add 8hp & 14 torque to the wheels.
No check engine lights
Direct bolt on
Less installation time than headers
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Old 08-25-2010, 09:02 PM   #2
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Default Re: Headers vs High Flow Precats

IMO....unless your really trying to get every last HP out of the car...the precats are the way to go. You gain almost the same amount of HP, with half the work, and no CEL lights...where most people have CEL lights running headers, and its impossible to find the o2 Simulators these days. Also, $200 less expensive then the Cattman headers, and less expensive to install...I dunno...I just think the precats are the way to go, I know if I didn't already have headers, I would do the precats over the headers.
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Old 08-25-2010, 10:10 PM   #3
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Default Re: Headers vs High Flow Precats

Subscribed for more comments....
(i dont know crap about power gains. So I'll sit and watch. lol)
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Old 08-25-2010, 11:10 PM   Thread Starter #4
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Default Re: Headers vs High Flow Precats

Need input from those who has headers --- how much hp and trq does it add to the wheels?
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Old 08-25-2010, 11:22 PM   #5
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Default Re: Headers vs High Flow Precats

I did a dyno last year w/ just the Jita. (219hp)
Getting an ebay exhaust next week, then I hope to do another dyno.
Then I'm looking to do the y-pipe and another dyno.
Theeeennn, this one and another dyno.

Has anyone done this already, cause I don't wanna spend the money but will for science?

Hope to do this in the next 2 months
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Old 08-25-2010, 11:23 PM   #6
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Default Re: Headers vs High Flow Precats

Im leaning towards getting the high flow cats but still not too sure
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Old 08-25-2010, 11:50 PM   Thread Starter #7
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Default Re: Headers vs High Flow Precats

Yea im thinkin of getting the high flow pre cats over headers....
Can only get the max to put out a certain amt of power with just bolt ons right?

SPRAY THE REST OF THE WAY!!!!!!!
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Old 08-26-2010, 12:06 AM   #8
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Default Re: Headers vs High Flow Precats

I just wish there was someone who has them and can give us a review on these cats
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Old 08-26-2010, 12:09 AM   Thread Starter #9
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Default Re: Headers vs High Flow Precats

Originally Posted by hero782 View Post
I just wish there was someone who has them and can give us a review on these cats
Well they just just just came out.. they are actually doing a presale for the first 15 ppl to buy them so thats how new it is. Just give it some time lol.
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Old 08-26-2010, 12:15 AM   #10
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Default Re: Headers vs High Flow Precats

Problem is, these are brand new, so nobody has had a chance to test them yet. With these and the RacingLine Y-Pipe, you should add about 20-22HP to the wheels.

If I remember correctly, Cattman headers with y-pipe add about 25-27HP to the wheels.

Pricing wise...these pre-cats and RacingLine y-pipe will run you $750+shipping. Cattman Headers and Y-Pipe will be about your looking at $1225+shipping...so if that extra 5-8HP is worth an extra $500...be my guest.

Install wise...probably looking at about 2-3 more hours of install time for headers then the pre-cats....if you figure $60 an hour at a normal shop, thats an additional maybe $180...

Keep in mind, these are not exact figures, but the prices on the cattman and racingline products are what they list at .org discounts CURRENTLY. The labor costs...all depends where you go and who you know.

Also, 99% of members with headers throw a CEL...which creates trouble with inspections as well. These pre-cats shouldn't cause that problem.
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Old 08-26-2010, 12:18 AM   #11
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Default Re: Headers vs High Flow Precats

I know there brand spanking new thats why I wanna jump on the deal cause racingline almost never has there stuff on special
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Old 08-26-2010, 12:27 AM   #12
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Default Re: Headers vs High Flow Precats

[QUOTE=BLKMAGIC;46963
Also, 99% of members with headers throw a CEL...which creates trouble with inspections as well. These pre-cats shouldn't cause that problem.[/QUOTE]

Is there actually a member who did not throw a code. And, does he know why he didn't? lol

Thats the reason I won't do the headers.

I think its a great purchase, just gotta be proven. Hopefully I can help out with that since I'm changing over the mods of more "show" than "go" to GO!
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Old 08-26-2010, 12:31 AM   #13
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Default Re: Headers vs High Flow Precats

I remember there being one guy on the big org that didn't...but he didn't do anything special, just happened to work out for him....dumb luck I guess. Everyone else (including myself) is throwing codes
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Old 08-26-2010, 12:40 AM   #14
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Default Re: Headers vs High Flow Precats

Originally Posted by BLKMAGIC View Post
I remember there being one guy on the big org that didn't...but he didn't do anything special, just happened to work out for him....dumb luck I guess. Everyone else (including myself) is throwing codes
Sounds like a boat load of luck. Congrats to anonymous header man! Sucks for the rest of us.
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Old 08-26-2010, 01:00 AM   #15
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Default Re: Headers vs High Flow Precats

I love my headers but hate that damn cel. If i could do it all over i would go with these precats hands down.
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Old 08-26-2010, 01:20 AM   Thread Starter #16
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Default Re: Headers vs High Flow Precats

Shayne doesnt throw any CEL... His is perfect.. one of the only ones that i know of!

I already have the racingline y pipe with the cattman b pipe so i'm probably gunna end up getting these pre cats!!

Plus.. with headers.. gas milage is down the drain.. i wonder how these do?
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Old 08-26-2010, 01:27 AM   #17
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Default Re: Headers vs High Flow Precats

when are you planning on ordering yours I3LAZEN?
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Old 08-26-2010, 01:41 AM   #18
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Default Re: Headers vs High Flow Precats

If i didnt already have headers id definately go this route.. But i am definately looking forward to see whats the outcome with these whoever to decides to go this route..
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Old 08-26-2010, 06:51 AM   #19
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Default Re: Headers vs High Flow Precats

well if everything goes according to plan i should be getting the precats in the next 4 to 6 weeks, right now i need to get some tires and other stuff for my station wagon lol
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Old 08-26-2010, 01:55 PM   Thread Starter #20
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Default Re: Headers vs High Flow Precats

Originally Posted by hero782 View Post
when are you planning on ordering yours I3LAZEN?
ehhhh ima hold off on this for a little.. i wanna get a indash and stillen side skirts first..

this would be my last performance bolt on for the car as i'd have ev erything else except NOS!!!!
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Old 08-26-2010, 02:12 PM   #21
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Default Re: Headers vs High Flow Precats

How long is the Pre cat install? Then I will give my input.
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Old 08-26-2010, 02:17 PM   #22
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Default Re: Headers vs High Flow Precats

Originally Posted by CleanMaxx View Post
How long is the Pre cat install? Then I will give my input.
Instructions say 4hrs.
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Old 08-26-2010, 03:07 PM   #23
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Default Re: Headers vs High Flow Precats

From a previous thread...

You can read more about it here: New Racingline High Flow Precats - In Development

Originally Posted by Cattman View Post
I can see that the metallic core pre-cats offer advantages over ceramic cats, but to compare the performance with headers is absurd, so I'm going to offer some corrections.

First of all, if you're going to measure performance, start out with a car that's running correctly. Bad tuning can skew the results in either direction. You can say the car picked up 8whp despite poor tuning, but its also possible that the car made that much hp because of the poor tuning. Bottom line is the dyno results are not valid.

y-pipe + pre-cats = tuned headers and y-pipe? No, that's not the case. The Cattman header/y-pipe combination has been dynoed many times at 25-26whp. You NEVER speculate about the performance results of combining two different parts, based on seperate and unconnected dyno testing. If you want to know the performance total of two parts, then you find a car that's running properly, baseline without the two parts, and then dyno after installing them. Anything else is wishful speculation.

Installation? Anyone who pays for 8-12 hours of installation time when installing headers has gotten hosed royally. Our prototype headers, installed by a Honda mechanic who had never worked on a Maxima before, were done in 6 hours including the wiring. We tell our customers that if the garage can't install them in 5-6 hours, take your business elsewhere - they are either expecting you to pay for their tranining, or they know better and are just trying to screw you.

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Old 08-26-2010, 03:10 PM   #24
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Default Re: Headers vs High Flow Precats

I personally prefer and would take headers anyday. I have headers and I've been greatly impressed with their performance. I'm not saying the precats aren't effective but from a performance standpoint....headers all day. You will get this from the muscle car guys as well.

Now from a time/money perspective... Precats are a great option. Especially for the 6.5gens and 6thgen who want a balance of performance and looks at the same time without the headache of warranty and trying to find a good installer.
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Old 08-26-2010, 03:18 PM   #25
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Default Re: Headers vs High Flow Precats

Other insight from Maxima.org

gutted cat = FAIL or something like that. Why not buy an aftermarket y=pipe which deletes the cats? much safer.

My concern about gutting cats is they are both different sizes. So you have a 2.1/4" tube which suddenly opens up to about 4" (maybe more or less) and then about 6 inches farther along you go back to the 2.1/4" tube. This will cause turbulence, the exhaust gasses will flow much faster through the narrow pieces and slow down considerably at the wide gutted out piece. So you have 2 sides with different flow with huge areas which will have turbulent exhaust gas trying to speed on through. Not good for horsepower at all.

Assuming that a gas is flowing through a pipe of 2 inches at any speed you like. Suddenly it comes upon a chamber that is 2 to 3 times larger than the pipe it was flowing through. There will be a big drop in pressure, and a reduction of flow. Then the gas is forced back into the 2 inch pipe where suddenly it will be forced to flow at the original pressure and speed. But that area where the large chamber (gutted cat) will have much turbulence. Hope that makes sense.
Your cats hold a certain amount of pack pressure for the engine to run correctly. If you gut them, you lower the back pressure which may make the engine run bad. I would not do it either. It'll cost a fortune to get new ones to put it back to normal.
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