Quote:
Originally Posted by oldman
don't think so, the primary cats maybe, but the secondary probably so little as to be untestable at 455 to 550 HP levels.
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For years in the early stages of going from 49 state vehicles to 50 state vehicles when GM was having to deal with the C.A.R.B. stuff, GM noted that the secondary cats only came with a 5hp penalty at the engine. In the early years of this process GM notated it, once the 50 state assembly line became the norm they no longer mentioned the loss of power from having to run the secondary cats.
On my SS 1LE I noticed the power pick up when I deleted them, it was enough that in my testing area the RPM and speed at which the rear tires would break loose was lower. That along with the increase in sound was worth it to me.
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2019 Corvette Z06 2LZ A8 - Halltech CAI, AWE non-catted X-pipe, Mamo V2 ported TB 592rwhp, bone stock 566rwhp
2017 Camaro SS 1LE - Procharger D1SC w/ Tial 2" BOV & Race intercooler / ARH full length catless headers / Alky meth injection system - 650rwhp on conservative tune SOLD