C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Hooker/TPiS/Exotic Muscle

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Old Sep 15, 2004 | 03:27 PM
  #21  
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From: San Jose Pat Tillman - American Hero
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Re: the EM headers - you will need to have 02 bungs welded in by your install shop.
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Old Sep 15, 2004 | 07:06 PM
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Originally Posted by bradvette
I have a manual tranny, and in my '90 there was almost ZERO fitment issues for the Hooker #2149's....and this includes the Hooker front Y-pipe. I think they're fantastic.
Hookers are a crap shoot. Many love them, many don't. They're great when they're on, but GETTING them on can be a problem. Bolt holes on the passenger side did not line up, drivers side collector flange gouges into the floor of the car. And don't get me started on my experiences with the Y-pipe. Hookers customer service told me it was MY problem that I had gotten the "old design" pipe. I should have exchanged it and gotten the re-designed one. They blamed Summit for poor stock rotation after I said it was THEIR responsibility to recall the pipes that they knew were defective. Hooker will never see another dime from me.
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Old Sep 15, 2004 | 07:28 PM
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OK so we have 1-5/8 vs 1-3/4 to choose from, BUT what about Cats vs NO-Cats????\

So if you have 1-3/4 with cats vs 1-5/8 without cats are they equal???? The possibilities......

Actually EM told me that high flow cats could result in better overall performance than no cats.....so environmental issues aside should we be running high flow cats with LT's to get maximum performance???
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Old Sep 15, 2004 | 07:41 PM
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Originally Posted by LT4BUD
OK so we have 1-5/8 vs 1-3/4 to choose from, BUT what about Cats vs NO-Cats????\

So if you have 1-3/4 with cats vs 1-5/8 without cats are they equal???? The possibilities......

Actually EM told me that high flow cats could result in better overall performance than no cats.....so environmental issues aside should we be running high flow cats with LT's to get maximum performance???
1-3/4 with cats does not equal 1-5/8 without cats.

EM probably told you to go with high flow cats because it increases backpressure a bit as opposed to basically straight pipes...alot of people gut their cats...I would recommend sticking with a high flow cat.
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Old Sep 15, 2004 | 07:42 PM
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Originally Posted by LT4BUD
OK so we have 1-5/8 vs 1-3/4 to choose from, BUT what about Cats vs NO-Cats????\

So if you have 1-3/4 with cats vs 1-5/8 without cats are they equal???? The possibilities......

Actually EM told me that high flow cats could result in better overall performance than no cats.....so environmental issues aside should we be running high flow cats with LT's to get maximum performance???
1-3/4 with cats does not equal 1-5/8 without cats.

EM probably told you to go with high flow cats because it increases backpressure a bit as opposed to basically straight pipes...alot of people gut their cats...I would recommend sticking with a high flow cat, but that recommendation comes from working with a porsche engine, not an LT1/4.
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Old Sep 15, 2004 | 07:59 PM
  #26  
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Originally Posted by LT4BUD
So if you have 1-3/4 with cats vs 1-5/8 without cats are they equal????
The header tube size, and the w or w/o cat, issues are are totally unrelated.

RACE ON!!!
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Old Sep 15, 2004 | 08:22 PM
  #27  
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Originally Posted by CFI-EFI
The header tube size, and the w or w/o cat, issues are are totally unrelated.

RACE ON!!!
OK, so do you run high flow cats or not??? Benefits of yes vs no??

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Old Sep 15, 2004 | 08:25 PM
  #28  
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Originally Posted by LT4BUD
OK, so do you run high flow cats or not??? Benefits of yes vs no??

Me? On MY car?

No cats at all.

RACE ON!!!
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Old Sep 16, 2004 | 07:37 AM
  #29  
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If I lived somewhere other than CA with less strict emissions, my cats would be long gone... but since I live in CA, I can't get rid of them. So I'm gonna be getting high-flow cats in the near future. The only thing I can think of that could be the benefit of using high flow cats, is that it creates a little bit of back-pressure which will keep some torque or gain you some, while increasing horsepower as well......... as opposed to straight pipes, in which you wouldn't have as much of a torque gain, or no torque gain, or maybe even a loss of torque. But you'll gain the same amount of horsepower, if not more, depending on other mods and if you actually need the "open-ness" of the straight pipe compared to the high-flow cat. Correct me if I'm wrong please, I know I probably am in one way or another.
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Old Sep 16, 2004 | 10:24 PM
  #30  
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Originally Posted by Perfusion
Re: the EM headers - you will need to have 02 bungs welded in by your install shop.

My EM #C1180's came with o2 bungs installed and coated.. you can see them and the AIR hookup's in this pic.. http://www.digitalcorvettes.com/phot...headerlose.JPG
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Old Sep 16, 2004 | 11:13 PM
  #31  
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Thanks C4Crazy, that is exactly the pic I need to see. They have a few headers for the LT1/4 on their site and I was wondering which one I was looking for. That cleared it up for me. Thanks again!
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Old Sep 16, 2004 | 11:22 PM
  #32  
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none of the l/ts are an easy install due to the limited space under the hood of the c4,but it is well worth the extra money to get the exotic muscle pieces since all other brands have several complaints while the em pieces are always praised for the fit and finish of there product. save yourself any headaches and get the exotic muscle long tubes. they fit my lt4 perfect. the only fitment issue was the air tube on the passenger side had to be shortened about 1" to line up.
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Old Sep 17, 2004 | 06:39 PM
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Originally Posted by CYLT4
...the only fitment issue was the air tube on the passenger side had to be shortened about 1" to line up.
That's why I just removed the entire AIR system. I'm install cats, but since I can't pass visual inspection without stock cats, and the AIR system is of dubuious value for emissions, I had the AIR system disabled when I had the PCM reflashed.

Eric
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