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Old 03-22-2021, 12:27 PM   #1
Dirty Rick
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Default What's our favorite 3" Cat Convertor

For a 300+HP redblock
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Old 03-22-2021, 01:36 PM   #2
culberro
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Whatever the race cat Mandrel Bend Solutions sells.
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Old 03-22-2021, 08:58 PM   #3
DET17
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Dave Barton was running the unit that ADP Turbo sells. Looked to be much higher quality than the one I've got on my sedan.

However, my engine certainly isn't 300ponies.... can't speak for his B21. Still, a nice quality 3" high flow cat.
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Old 03-22-2021, 10:05 PM   #4
2turbotoys
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I used this before, pretty inexpensive at $99.

https://www.summitracing.com/parts/m...xoC6IkQAvD_BwE

But I prefer this one in SS if you only have a visual emissions check:

http://www.siliconeintakes.com/dsm-i...ter-p-320.html
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Old 03-23-2021, 03:01 PM   #5
dl242gt
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My setup uses a 3" Carsound which I believe is a Magnaflow brand if they even still make them. It's the same one on there since 2003 when I got the system. Last time I had to check emissions it still passed even being over ten years old.
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