LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Who's Running High Flow Cats?

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Old Sep 15, 2009 | 01:06 PM
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Question Who's Running High Flow Cats?

I believe one of my two have blown out and looking to see who's running High Flow Cats on their car and what are the gains or power losses you've had. Does anyone have dyno sheets to prove gains with the different brands out there?
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Old Sep 15, 2009 | 01:31 PM
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Best High flow cats avail
http://www.frozenboost.com/product_i...4dc11f7f10267a
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Old Sep 15, 2009 | 01:33 PM
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a good pair of high flow cats will lose 1rwhp to a straight ORY
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Old Sep 15, 2009 | 04:54 PM
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Originally Posted by Elliott's94Z
hahaha x2
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Old Sep 15, 2009 | 05:53 PM
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Originally Posted by Elliott's94Z
Pretty cheap cat there. You'll pass smog no problem!
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Old Sep 16, 2009 | 10:37 AM
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i asked the same question on here and got the frozen boost responses. It is an interesting concept. however, i can't stand the stink of no cats, especially on me after I'm done driving the car, so I went with the LG 3" cats which are slip on and didn't need welding. Also, metallic substrate. They are 150/each for the 3" version and 200 for the 2 1/2" versions. I'm planning install this weekend...
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Old Sep 16, 2009 | 05:50 PM
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I have two metallic Thunderbolt cats welded into my y-pipe and they seem to be working fine for me. I think they were ~$50 each.
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Old Sep 16, 2009 | 07:41 PM
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I have the single cat on my 93 and replaced it with a "High Flow" Magnaflow and am very happy. I believe it flows better than stock. Exhaust note from cat back got a little louder!
I have seen others recommend it as well. Passed Emmisions easily. Not sure about metal substrate.

Last edited by DriftR; Sep 16, 2009 at 07:50 PM.
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Old Sep 16, 2009 | 08:03 PM
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Originally Posted by Elliott's94Z
+1 just get it tuned out, itll cost you less then buying them
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Old Sep 16, 2009 | 11:40 PM
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I had magnaflow with ORY then had to throw in a magnaflow high flow cat and it actually helped me out a little down low with the added backpressure but now my car is whisper quiet compared to what it was and I hate it
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Old Sep 16, 2009 | 11:56 PM
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cats? what are those?! ha ha.... the only downside to it is that it smells like a lawn mower

Last edited by B4CZR2; Sep 17, 2009 at 12:17 AM.
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Old Sep 17, 2009 | 12:03 AM
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I lost my kitties... $25 to get rear o2s out, can't beat it.
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Old Sep 17, 2009 | 02:26 PM
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i just got a 3 inch higflow cat and 2 1/4 inch y pipe from manifolds. i got 7 hp to the wheels form it. the cars a 94 z28
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Old Sep 17, 2009 | 02:31 PM
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!!!!!!
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Old Sep 17, 2009 | 06:34 PM
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Looks like there are some mixed issues here. So if I decide to delete the cats, do I have to send the PCM off to a tuner or what?
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Old Sep 17, 2009 | 08:46 PM
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I got magnaflow ones too. The reason I went w/ them is because of the smell.

Working great.
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Old Sep 17, 2009 | 09:53 PM
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Originally Posted by SS#502
Looks like there are some mixed issues here. So if I decide to delete the cats, do I have to send the PCM off to a tuner or what?
You don't have to, but it will set off your SES light.
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Old Sep 19, 2009 | 08:01 AM
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Originally Posted by hitmanws6
a good pair of high flow cats will lose 1rwhp to a straight ORY
I lost 7 RWHP with my old Pypes mini cats. Plus it made a small but ugly dip in the torque curve. All in all, not much loss.
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Old Sep 19, 2009 | 05:38 PM
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Thanks for the info guys! The last couple of days the cars been in the garage and I've been gutting out the cats while I have her taken apart. I think I'll get some headers and a y-pipe here in the next couple of weeks.....
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Old Sep 19, 2009 | 07:05 PM
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Originally Posted by Elliott's94Z
This is something I have been looking for to fool the inspectors that my car has cats, even though they don't do any emissions tests, a visual is a must.

I am buying 2 and placing them right into the Y-pipe!
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