Originally Posted by bcfromfl

When you say that "they didn't have too much of an effect," do you mean on boost pressures (i.e. restricting the exhaust and increasing boost), or on sound levels, or both?

Originally Posted by jmroy6

GESI makes a nice high quality drop in cat that will withstand the high egts from boost. i know Seb tuned a nismo 370z with these cats on a stillen sc and had good results.

link https://www.vibrantperformance.com/c...Path=1527_1326