Will I lose low end torque/HP?

The 1UZFE EGR Delete Kit is available for sale here.

sc40097

New Member
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Location
Midlothian
I have a 1997 SC400 and my car has the stock cali. edition exhaust with the third cat and 2 small resonators. After watching this youtube video https://www.youtube.com/watch?v=7ZnclTUvbPc I fell in love with the sound. So I was just wondering if deleting the center cat and replacing it with an x pipe, while also replacing the last two mufflers with straight pipe would cost me low end torque/power? And what size piping would I want to use?
 
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