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The other thought I had was concerning the VX motor specifically, how it may effect lean burn, vacuum, etc. . .
I think on the highway a hollow cat would breath better and get better mpg provided running 2500rpm or so. But what about city driving, where much of it may be done at or below 1500rpm, I know there has been talk about the benfits of low end torque there. Just a theory, I'm certainly not about to buy another cat to try out
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