OEM Cat mod
12-01-2014, 12:33 PM
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OEM Cat mod
Hello. I've heard that the stock catalytic converter consists of two catalytic cores that are separate and have a small gap between them and that it can be cut right in the middle and delete the second core. Has anyone tried it? Thoughts?
In the following picture you can see the stock catalytic converter without the heatshields. i guess the smaller diameter part in the middle is the gap between the two elements.
In the following picture you can see the stock catalytic converter without the heatshields. i guess the smaller diameter part in the middle is the gap between the two elements.
12-01-2014, 02:21 PM
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yeah that's true it would be better if i welded it myself but the exhaust garage asked me 60$ for the job and says he's done it a few times. The HFC costs 250$ plus it will be broken in 20k miles
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12-02-2014, 01:32 AM
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That's true. It is said that the stock cat is 400 CPSI but I believe by reducing the length of the cat to the half would improve the flow restriction a lot.
12-02-2014, 06:09 AM
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[/quote]
The total square "face" area of the honey comb core would be the CPSI, not length IMO.
If you ask me, you're wasting your money/time. The OEM CAT is quite effective and you won't see much in regards to HP unless you are Tubro'd or Super Charged.
The biggest gain from N/A by removing the OEM cat is being able to lower the VTEC engagement point to gain mid-torque/HP. But you will need some type of tuning device in order to do so. Without it, you won't see much HP to make a difference.
12-02-2014, 08:45 AM
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CPSI stands for cells per square inch. I'm not saying that cutting the cat in length will reduce the CPSI but it will reduce the total restriction. I know that the most significant benefit from removing the cat is the ability to lower the vtec and I am planning to tune and lower the vtec engagement in the future with AEM EMS or Hondata but for now since I have a catback exhaust and since the main restriction in an exhaust system is the cat I want to free the cat flow to take full advantage of my catback system.