heard something bad about highflow cats
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Joined: Sep 2008
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heard something bad about highflow cats
i was lookin forward to gettin some highflows put on my 97 5.4 but a local muffeler shop had said that they would damage the truck in the long run. currently i have shorty headers with true duals. i have a small leak in the passenger side front cat and its driving me crazy! 
i just need to know if there is any chance of damage to anything and if i should get oem cats or feed my addiction and go with the highflows. 
thank you for any advice!
i just need to know if there is any chance of damage to anything and if i should get oem cats or feed my addiction and go with the highflows. thank you for any advice!
Senior Member
Joined: Nov 2007
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From: whaleyville, MD
all the cats do is provide the little backpressure you need for the engine and reduce emmisions. it wont really hurt the engine. now if you had no cats and it read rich then it could hurt the engine because it may try to lean out the A/F mixture too much.
Best explanation.
Senior Member
Joined: Feb 2007
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From: Native New Yorker
High flow cats will damage the truck in the long run?......hahahahaha, DOOD find another shop to help you with your exhaust.
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Senior Member
Joined: Oct 2007
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From: farmington hills, MI
lies! i have no cats for almost 3 years my engine is still runnin fine. i love the smell of non cated exhuast ummmm. high flow cats and OEM cats are the same design. so i dont see how it could hurt. never ran them thoe just saying 
oh n ya might wanna get a new shop.
oh n ya might wanna get a new shop.
turns out, i found a new shop. ill try and get a vid on here when i get em on!
Senior Member
Joined: Aug 2007
Posts: 2,441
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From: Scottsdale, Arizona
i was lookin forward to gettin some highflows put on my 97 5.4 but a local muffeler shop had said that they would damage the truck in the long run. currently i have shorty headers with true duals. i have a small leak in the passenger side front cat and its driving me crazy! i just need to know if there is any chance of damage to anything and if i should get oem cats or feed my addiction and go with the highflows. thank you for any advice!
i just need to know if there is any chance of damage to anything and if i should get oem cats or feed my addiction and go with the highflows. thank you for any advice!After high flows = No CEL
Kinda speaks for itself...
Senior Member
Joined: May 2008
Posts: 2,703
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From: Friendswood, Texas
ive noticed that the shops around here that are too lazy to install cats talk bad about high flows all day long
and the ones who actually do good work and do what you want them too say all the good things about them..
and the ones who actually do good work and do what you want them too say all the good things about them..