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Old 11-12-2011, 10:09 PM   Thread Starter #1
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Default Headers Related Question

Hello.
So here is the problem. Have a 04 maxima with a bad engine. Swapping it with an 07 motor. Now, i think my cats are bad so im leaning towards ebay altima 3.5 headers since the motor is out of the car still and i can have PITA free install. Now, i have EGR, so i will have to weld a port into the header which is not a big deal. For o2 issue, use 350z downstream o2s with spacers to eliminate CEL (thanks to NiZMo1o1 for filling in)

Now, here is the thing. After reading "Exhaust 101" and the thing about CFM, im slightly confused.

Say, i get the ebay headers but i keep the stock muffler and b pipe, would i still gain the claimed 20-25HP from headers and custom y pipe?
After looking over the Exhaust 101, it seems id get little benefit from headers if i keep the stock mufflers or did i read it wrong?

Thanks.
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Old 11-12-2011, 10:20 PM   #2
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Default Re: Headers Related Question

Your exhaust is only as free flowing as it's narrowest point. To fully utilize headers, you should also do the exhaust.


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Old 11-12-2011, 10:39 PM   Thread Starter #3
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Default Re: Headers related question

Originally Posted by 1hawaii50 View Post
Your exhaust is only as free flowing as it's narrowest point. To fully utilize headers, you should also do the exhaust.


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Yeah, really dont want to. Cost/noise is the problem.
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Old 11-13-2011, 01:29 AM   #4
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Default Re: Headers Related Question

One thing that read is wrong. The upstream sensors are the ones you need to use, not downstream. You know the highest ones.

---------- Post added at 11:29 PM ---------- Previous post was at 11:29 PM ----------

Originally Posted by L36 View Post
Yeah, really dont want to. Cost/noise is the problem.
Then leave it stock. Oh and why teh 07 engine, why not an 06 engine with a 6spd manual. That's just what I would do if I had to get a new engine and didn't have a manual.
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Old 11-13-2011, 01:41 AM   #5
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Default Re: Headers Related Question

@Raz76 whats different from the manual transmission engine and the auto transmission engine?
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Old 11-13-2011, 01:57 AM   #6
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Default Re: Headers Related Question

Originally Posted by DViious View Post
@Raz76 whats different from the manual transmission engine and the auto transmission engine?
Nothing as long as you go with an 04-06 engine to do a manual swap. 07 and 08s are different as far as I know.
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Old 11-13-2011, 02:11 AM   #7
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Default Re: Headers Related Question

hmmm good info changing my 4spd soon!
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Old 11-13-2011, 02:39 AM   #8
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Default Re: Headers Related Question

07-08 , same block different intake manifold,

09 ( would need to change upper oil pan to fit 6spd tranny )
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Old 11-13-2011, 07:17 AM   #9
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Default Re: Headers Related Question

Originally Posted by L36 View Post
Hello.
So here is the problem. Have a 04 maxima with a bad engine. Swapping it with an 07 motor. Now, i think my cats are bad so im leaning towards ebay altima 3.5 headers since the motor is out of the car still and i can have PITA free install. Now, i have EGR, so i will have to weld a port into the header which is not a big deal. For o2 issue, use 350z downstream o2s with spacers to eliminate CEL (thanks to NiZMo1o1 for filling in)

Now, here is the thing. After reading "Exhaust 101" and the thing about CFM, im slightly confused.

Say, i get the ebay headers but i keep the stock muffler and b pipe, would i still gain the claimed 20-25HP from headers and custom y pipe?
After looking over the Exhaust 101, it seems id get little benefit from headers if i keep the stock mufflers or did i read it wrong?

Thanks.
Originally Posted by 1hawaii50 View Post
Your exhaust is only as free flowing as it's narrowest point. To fully utilize headers, you should also do the exhaust.


Posted Via Tapatalk
Originally Posted by L36 View Post
Yeah, really dont want to. Cost/noise is the problem.
I understand, I was simply trying to answer your question. I would never expect to gain what the manufacturer says you are going to gain. Not unless I know EXACTLY what engine and conditions that their parts are dyno'd under/with. If you don't want to deal with a full exhaust, or cost is an issue, then stick with OEM. HOWEVER, to fully utilitze a set of headers, you should also do the exhaust.
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Old 11-13-2011, 08:27 AM   Thread Starter #10
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Default Re: Headers Related Question

Originally Posted by 1hawaii50 View Post
I understand, I was simply trying to answer your question. I would never expect to gain what the manufacturer says you are going to gain. Not unless I know EXACTLY what engine and conditions that their parts are dyno'd under/with. If you don't want to deal with a full exhaust, or cost is an issue, then stick with OEM. HOWEVER, to fully utilitze a set of headers, you should also do the exhaust.
I understand. I was hoping id run into someone who has such setup. Thanks for the input.

Originally Posted by Raz76 View Post


Nothing as long as you go with an 04-06 engine to do a manual swap. 07 and 08s are different as far as I know.
The 04-08 engine block is identical, its only the intake and the exhaust manifold that are different.

Engine was only $900 with 41K miles. Not bad if you ask me.
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Old 11-13-2011, 09:46 AM   #11
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Default Re: Headers Related Question

How long do you plan on keeping the car? If you plan on keeping it long term, get the headers. Our pre-cats are known to fail, you will eventually have to replace them down the road. If you go the header route, you won't have that issue and you can always upgrade the exhaust. Y-Pipe etc at a later time.

I think you would see some benefits from Headers/Y-pipe (stock catback/muffler) combo but like Hawaii said, not the full amount.
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Old 11-13-2011, 12:12 PM   #12
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Default Re: Headers Related Question

Originally Posted by L36 View Post
Originally Posted by 1hawaii50 View Post

I understand, I was simply trying to answer your question. I would never expect to gain what the manufacturer says you are going to gain. Not unless I know EXACTLY what engine and conditions that their parts are dyno'd under/with. If you don't want to deal with a full exhaust, or cost is an issue, then stick with OEM. HOWEVER, to fully utilitze a set of headers, you should also do the exhaust.
Very logical. I'm following Raz's thread on his header setup, and I don't wanna run the exhaust (full) too because of the noise factor...(too old for that), as well as I know this is not a car I wanna keep for a long time. Over the years, I've changed cars on a rate of at least one a year. To do all that mod right now to my 6th gen, is not very logical, but the cats are gonna go soon and headers is cheaper. I read a lot to understand what I'm dealing with/options, so, yes, your point of view makes sense to me too...thanks for that, chief!
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