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10-17-2012, 09:25 PM
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#1 |
 
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HP difference between having Cats or no cats
Im going back and forth about getting cats. i know in most states there are laws about having cats but im not really worried about that. just curious about the actual horse power difference
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10-17-2012, 09:41 PM
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#2 |
    Drives: his wife crazy buying mods Join Date: May 2012
Location: Gilmer, TX
Posts: 1,342
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Really no noticeable difference. I believe someone tested and there 1-2 hp difference.
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10-17-2012, 09:58 PM
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#3 |
       
Drives: 2015 c7 Join Date: Nov 2009
Location: MI
Posts: 7,462
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really not much differences. i went cats because no cats tends to smell little more.
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10-17-2012, 10:41 PM
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#4 |
Drives: 11 Seconds or Faster Join Date: May 2012
Location: Arvada, Colorado
Posts: 2,797
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You won't regret getting cats, because the hp difference is debatable at best. However, you could regret no cats because of the smell.
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10-17-2012, 11:07 PM
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#5 |
Drives: 2017 Camaro SS1LE 2000 Trans Am WS6 Join Date: Jul 2008
Location: Portland, TN
Posts: 2,955
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Are you planning any forced induction? Lots of issues with aftermarket cats and high horsepower. Here's one of my Kooks.
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10-18-2012, 11:16 AM
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#6 |
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thanks guys ive decided to get the cats
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10-18-2012, 11:33 AM
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#7 | |
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Account Suspended
Drives: 2012 2SS CAMARO 45th Join Date: Apr 2011
Location: St. Charles, IL
Posts: 18,663
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Quote:
It makes a lot of sense to stay with the high flow cats. You won't lose out on any power until the 700 horsepower range. So we only recommend off road pipes on big power or forced induction cars. If you have off road pipes....you are technically running illegal in any state. Some states check harder then others but in any state you can run into trouble. Most exhaust shops will refuse to work on your exhaust system if they see you don't have cats as well. |
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10-18-2012, 01:52 PM
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#8 | |
Drives: 2006 F150 Lariat Join Date: May 2010
Location: Florida
Posts: 1,665
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Quote:
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10-18-2012, 02:28 PM
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#9 |
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V8 Lounge member #2
Drives: 2001 Ws6 Join Date: Sep 2009
Location: Burbank,IL
Posts: 6,373
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Its not illegal like a federal offense now lol, it woild be a vehivle code violation. Cats moved or removed from the stock locations are illegal anyways. So as soon as you slap Lt's your not "legal". But who cares lol, I'm Catless on all my cars, kids and wife LOVE the smell of overlap lol.
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10-18-2012, 03:40 PM
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#10 |
Drives: 2000 Camaro SS Join Date: Feb 2010
Location: Louisville, Ky.
Posts: 25,179
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Between high flow cats and no cats there is almost no difference. You are talking about 2-3 rwhp here and there.
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10-19-2012, 03:30 AM
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#11 |
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Account Suspended
Drives: 2017 Camaro ZL1 A10 Join Date: May 2012
Location: NJ
Posts: 7,692
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Where can I find the dyno info on this comparison? Does anyone know exactly who did the comparo and when it was done?
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10-19-2012, 05:24 AM
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#12 |
Drives: 2017 1SS 6spd Join Date: Jan 2011
Location: Utah
Posts: 2,869
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I'm pretty sure Jannetty Racing did a spreadsheet on several brands showing as little as 1hp gains on no cats vs hfc's.
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10-19-2012, 05:34 AM
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#13 | |
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aka Patrick
Drives: '10 Camaro 2SS '04 Silverado Join Date: Jan 2009
Location: Derby Kansas
Posts: 3,072
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Quote:
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10-19-2012, 05:39 AM
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#14 |
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Drives: 2017 1SS 6spd Join Date: Jan 2011
Location: Utah
Posts: 2,869
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