Catalytic converter help!!!

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kbuskill

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$230 each just for the cats, no labor?!

I have two 2.5" MF cats that have been kickin' around my shop for years. I might have to sell 'em and buy Jenn a fancy dinner.

I wonder if I installed those 2.5" cats in my downsized, 2.25", Y-pipe if I would pickup anymore low end TQ???
 

iamdub

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I wonder if I installed those 2.5" cats in my downsized, 2.25", Y-pipe if I would pickup anymore low end TQ???

Probably a little, but then you'd likely choke it a little and lose upper-end power. I know it's not a high-RPM race truck, but it'd suck making it take longer to pass a slow vehicle in front of you. The low-end TQ gets it going. But, once you're moving, you need mid- and upper-end power.

I have to admit that I was looking at my Y-pipe to see if I could fit them in there. Then, I could go back to my single 18" muffler or that 22" one. I guess it depends on how it sounds once I have the dump routed out the back cuz it's plenty quiet as I have it now. I don't mind the uncatted smell cuz it reminds me of older muscle cars and it smells almost like I have cats when I run E85.
 
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