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[Little Beavis]

You will gain some power taking off both cats, but I don't know if anyone has a "number" (doubt anyone did a before and after dyno). You won't pass emission tests if you have them in OH.

The springs are just there for the flex joint. Your best bet is to get a flex joint of your own and put that in there.

Have fun.

 

[seakrait]

depending on how emissions work in OH, it might be worth it to get a straight pipe and use it, putting on the cats only when you have to do emissions testing...

as long as you don't get pulled over and checked that is.

 

[Little Beavis]

I was thinking of one of the "mesh" / weave flex joints. The OEM type flex joints with the flange and such are hard to do.

http://www.exhaustproslinc.com/stainflex.html

This is what I was thinking. . .
And that place is pretty good on pricing and such. Got my components all from that place.