1965 ford fastback Decatting the exhaust? - Vintage Mustang Forums
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post #1 of 24 (permalink) Old 05-31-2016, 05:08 PM Thread Starter
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1965 ford fastback Decatting the exhaust?

I have Flowmaster Super 44's on my mustang in an H pipe format. Would it be possible to decat the exhaust? I'm also wanting to put drop springs on it because I want to minimize body roll as much as I can.

Thank you guys for your responses,

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post #2 of 24 (permalink) Old 05-31-2016, 05:20 PM
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Decat?? I assume you are referring to catalytic converters, right? are you actually required to have them where you are? Around here if they didn't come factory with them, you don't need them...

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post #3 of 24 (permalink) Old 05-31-2016, 10:14 PM
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Do a little more research before posting! 65's didn't come with catalytic converters. Do you mean take the guts out of you 44's?!
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post #4 of 24 (permalink) Old 05-31-2016, 11:53 PM
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Maybe it is a new catterized engine. Depending how new it is, the ecm will throw a fit if you knock the guts out of your catterizers. I think I have seen ad's for "high flow" cats which I think would be the way to do that if you are trying to increase exhaust flow.


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post #5 of 24 (permalink) Old 06-01-2016, 12:01 AM
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Maybe it is a new catterized engine. Depending how new it is, the ecm will throw a fit if you knock the guts out of your catterizers. I think I have seen ad's for "high flow" cats which I think would be the way to do that if you are trying to increase exhaust flow.
Question was in regards to a 1965 Mustang.
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post #6 of 24 (permalink) Old 06-01-2016, 02:06 AM
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Unless you have a new engine in an old Mustang, there are no cats to "decat". The only thing you could do is remove the mufflers entirely, or I guess remove the exhaust entirely... if you're trying to make it louder or something. Not sure what the goal is.

If you want to minimize body roll, you want stiffer springs.


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post #7 of 24 (permalink) Old 06-01-2016, 11:32 AM
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post #8 of 24 (permalink) Old 06-01-2016, 01:14 PM
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I think he's got a carb on it........
He's got a video on an earlier post. It's plenty loud as it is.

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post #9 of 24 (permalink) Old 06-01-2016, 02:35 PM
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I can't wait to hear how cats got into your exhaust
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post #10 of 24 (permalink) Old 06-01-2016, 03:08 PM
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I can't wait to hear how cats got into your exhaust
That's where the mice hide.

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post #11 of 24 (permalink) Old 06-01-2016, 03:15 PM
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Like a wood pile, the exhaust should be big enough for squirrels to pass but too small for cats.
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post #12 of 24 (permalink) Old 06-01-2016, 05:19 PM
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Drop springs won't really reduce body roll unless they're a stiffer than stock spring, and even then it's not a big difference. If you want to really reduce body roll a thicker than stock sway bar will help the most.

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post #13 of 24 (permalink) Old 06-01-2016, 06:36 PM
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post #14 of 24 (permalink) Old 06-01-2016, 07:46 PM Thread Starter
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In regards to my last post. The exhaust is aftermarket and it came with catalytic converters on it. I want to cut them off to make the car louder and of course to let the excess fuel burn to be able to pop flames a little.

The car has an eddolbrock four barrel on it.
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post #15 of 24 (permalink) Old 06-01-2016, 07:54 PM
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