high flow cats or no cats - ModernCamaro.com - 5th Generation Camaro Enthusiasts
V8 Engine Discussion 6.2L LS3/L99 V8 | Exhaust | Ignition | Induction | Intakes

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post #1 of 20 Old 02-08-2011, 07:52 AM Thread Starter
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high flow cats or no cats

I have slp high flow cats and I'm wondering if i take off the cats will i lose any power and will the car be louder?
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post #2 of 20 Old 02-08-2011, 08:02 AM
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You won't lose any power...and yes it will be loader, but will give you a CEL unless you tune them out. Also depending on your local laws you may run into inspection problems.

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post #3 of 20 Old 02-08-2011, 08:46 AM Thread Starter
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ok and what if i put muffler deletes for the track?
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post #4 of 20 Old 02-08-2011, 09:23 AM
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With high flo cats and muffler deletes your car wont be crazy loud. I run muffler deletes and replaced my l99 resonator with an xpipe and its starting to get loud.

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post #5 of 20 Old 02-08-2011, 09:40 AM
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really no point in just taking your mufflers off at the track...probably not really worth the effort. If you're just looking for loud, look into exhaust cutouts...best of both worlds.


do you have headers??? or just the SLP cats?

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post #6 of 20 Old 02-08-2011, 11:04 AM
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Everyone swears highflow cats flow just as free/good as having No Cats.

Everyone calls no cats crazy loud it all depends on the muffler setup you are running.

And just as powerfreak said there is really nothing to gain in taking your mufflers off at the track if you are going for that add some exhaust cutouts. QTP has some nice electric ones where you can open them up and close them ready for street use.
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post #7 of 20 Old 02-08-2011, 11:13 AM Thread Starter
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I have a complete SLP exhaust 3inch with LT headers
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post #8 of 20 Old 02-08-2011, 01:37 PM
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Ted from Jannetty racing did a test on no cats vs. high flow cats and the results were that running high flow cats won't cost you any extra horsepower. Running no cats also gets a little stinky at stoplights. High flows also deepen the exhaust tone a little compared to no cats.
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post #9 of 20 Old 02-08-2011, 01:41 PM
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Originally Posted by camaro34 View Post
I have a complete SLP exhaust 3inch with LT headers
I would leave it as-is...if you want loud go with cut-outs.

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post #10 of 20 Old 02-08-2011, 01:48 PM
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High flow
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