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post #1 of 15 (permalink) Old 05-26-2006, 03:48 PM Thread Starter
 
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gutt cats or get high-flow

hello i was just wonderin if i gutted my cats if it would sound the same as high-flow cats.i would gutt them but i have to pass emissions.usally i dont get a visual test done when i get emissions..but if anyone could help me i would appreciate it
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post #2 of 15 (permalink) Old 05-26-2006, 05:05 PM
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No cats/gutted cats is more flow than a high flow cat... too much flow can result in some backpressure loss, but added HP ... I have gutted my cats... and minimal flow restrictions thru out entire exhaust system... not a "seat of your pants" change in torgue loss from my experience. Sounds hella good with no cats and a muffler mounted mid-body.

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post #3 of 15 (permalink) Old 05-26-2006, 10:10 PM
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go with the high flow. You can pickup a pair of magnaflow carsounds for cheap. I got a pair of stainless 2.5" cats for less than $100 shipped.




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post #4 of 15 (permalink) Old 05-28-2006, 02:21 PM
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Hey, any leads on where I can find some downtubes for my 97 so I can put the High Flow cats I've got sitting in boxes on? I want to go to a 2.5" system from the stocker 2".

Also wondering if I should go with a Y pipe or an H pipe with the 2 High Flow Cats? I've got no resonator, but a hacked up stock beyond the 3rd cat (which I'd like to dump.).

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post #5 of 15 (permalink) Old 05-28-2006, 04:53 PM
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Quote:
Hey, any leads on where I can find some downtubes
you'll have to hit up your local exhaust shop.
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post #6 of 15 (permalink) Old 05-28-2006, 05:37 PM
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FordFanatic,

All the shops here are chicken****s. They don't want to do more than replace the Ford cats with new Ford cats.

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post #7 of 15 (permalink) Old 05-28-2006, 05:47 PM
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dan, pull your y-pipe, tkae it to a shop, tell them that you want a custom pipe setup to repalce this, and here, use this as the pattern. its a federal thing, if they take a cat off a car they have to replace it with a cat. but if you bring in the component they should do it for you

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post #8 of 15 (permalink) Old 05-28-2006, 06:51 PM
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Justin,

Just take the stock setup, plus the cats I want to use and they'll make up what I want?

Oh, one of the high flow cats has provision for air injection. Can I just have that tube welded shut as my T-Bird doesn't have an air pump on it?

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post #9 of 15 (permalink) Old 05-29-2006, 12:17 PM
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yes, they should, its different if its off the car , but research the shops in your area. if not i have a guy i could get you to hook up with . but he's waay out here

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69 cougar standard- 347/c6 -efi restomod, heidts prog 4 link heavily modified front, custom strutrods boxed lowers rollerperches 620 lowering springs! meier shock tower brace
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post #10 of 15 (permalink) Old 05-29-2006, 07:03 PM
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Quote:
Originally Posted by GreenBird
go with the high flow. You can pickup a pair of magnaflow carsounds for cheap. I got a pair of stainless 2.5" cats for less than $100 shipped.
i wouldn't get crapsound cats. I had them on my custom setup and one started to rattle not a month after the install. So what happened was i ordered a new one and while i waited for the cat to come in the mail the rattling stopped and got clogged and blew the headgasket in my supercoupe. I am almost certain that the cat clogged and its the reason why my hgs blew

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post #11 of 15 (permalink) Old 05-29-2006, 07:14 PM
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Pertaining to "gutted" cats. I've heard one T-bird with gutted cats. You could hear the resonance inside the cats. Sounded like two beehives under your floorboards. I wouldn't do that. I'd either replace the cats with straight pipe, or get high flow cats.


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post #12 of 15 (permalink) Old 05-29-2006, 07:37 PM
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Just so you know, contrary to what some people believe, if you have high flow cats, there is no loss in flow as opposed to straight pipe of the same inlet and outlet diameter in its place. Having them there will not hurt your performance at all provided the entire exhaust is appropriately sized for the power you are making.

In my opinion, if you have to pass emissions inspection, it just isn't worth the hassle of not having the cats on there. The extra money you will have to lay out now to have the cats welded on will be saved next time you need to get inspected and you have to search for someone to slide you through, or have a stock exhaust put back on for inspection then swapped again afterwards.

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post #13 of 15 (permalink) Old 05-29-2006, 07:40 PM
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I agree Mike. If KS had a mandatory exhaust inspection I wouldn't even THINK of going catless. But since they don't..........


1997 Thunderbird Sport
Low Miles
Wifes Car
destined to remain stock

1997 T-Bird GT 4.6
80 MM Mustang GT MAF - P&P'd Mustang GT TB and Intake Plenum - PI Intake manifold - PI Heads
Mark VIII Torque Converter - J-Modded 4R70W transmission - Mark VIII Aluminum Driveshaft - 3.73 gears
PBR Brake Calipers - Eibach Springs - KYB Shocks
'89 SuperCoupe front and rear sway bars
SCT Chip programmed by Lonnie Doll
255/50/16 Falken Ziex ZE-512's
True Dual exhaust with Magnaflow DI/DO muffler
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post #14 of 15 (permalink) Old 05-30-2006, 07:27 AM
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btw does any1 know how much of a difference highflow cats make in the emission tests vs stock cats?
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post #15 of 15 (permalink) Old 05-30-2006, 11:10 AM
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Quote:
Originally Posted by eg0r
btw does any1 know how much of a difference highflow cats make in the emission tests vs stock cats?
none

-91 Cougar LS, coming soon, complete overhaul with a 427" Windsor.
-90 XR7 5-speed black on black w/sunroof, MP2, coated rotors, double intercooler, 15%OD, ported heads, comp stage 1 cam, 85mm TB, 90MM LMAF, 80# injectors, and ported big valve heads
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