Porting stock 99' exhaust manifolds?
09-06-2005, 05:00 AM
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Porting stock 99' exhaust manifolds? Well the going back to stock process is starting, I was wondering if it is A) Possible to have a good porting job on 99' manifolds and B) Is it worth doing? TIA -Adam
09-06-2005, 05:37 AM
#2
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Originally Posted by 3.8SFITURBO
Well the going back to stock process is starting, I was wondering if it is A) Possible to have a good porting job on 99' manifolds and B) Is it worth doing? TIA -Adam
And why then try and 'mod' a stock component?
What manifolds do you mean - intake/exhaust/both?
An the answer would either be yes or no for A) depending on which manifold. And for B) No there would be no meausrable gain.
09-06-2005, 08:51 AM
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People used to do the "hollow log" mod but you
might be happier swapping on '00 manifolds
which flow pretty well and have EGR. Do not
know about what kind of AIR/EGR tube bending
might be involved....
might be happier swapping on '00 manifolds
which flow pretty well and have EGR. Do not
know about what kind of AIR/EGR tube bending
might be involved....
09-06-2005, 03:22 PM
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Originally Posted by 300bhp/ton
And why then try and 'mod' a stock component?
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My stockers are ported (cast iron). Combined with aftermarket Y w/cats I netted only ~7hp. No bang for your buck here. Aren't 98-99's stainless steel? These wouldn't be portable, would they?
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09-06-2005, 11:54 PM
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Originally Posted by FIREHAWK#608
Why are you going back to stock? Do you still need those Firehawk rims? Inquiring minds want to know! 
09-07-2005, 12:03 AM
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im sure you could pick up some 00?-02 exhaust manifolds really cheap i think 00 was the first year for the updated manifolds
http://www.hinsonsupercars.com/
ported manifolds $175, might be less if you send them a core.
http://www.hinsonsupercars.com/
ported manifolds $175, might be less if you send them a core.
09-07-2005, 12:59 AM
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I actually e-mailed Hinson about this about a month ago as I've been toying with the idea as well. Was told that cores are required, but didn't hear any mention of a price break. Also said that their ported '98-'99 manifolds flow similarly to 00+ manifolds. Don't know if it's worth it or not, but that's what I was told.
09-07-2005, 01:12 AM
#11
I talked to them awhile back. They said if you send them yours for porting it's $75. They said the gain on the 98-99's is about 8 rwhp. You might be able to modify the 00's to work, but if you run the 01-02's you won't have egr and won't be smog legal either.
