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At a car show a few weeks back I was able to experience exactly what you are asking and technically it shouldn't make a difference but I did notice a little change in the tone. Most will say its nothing but I pay attention to the little things so there was a difference to me.
Without the valves the growl was a little deeper to me.
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d1sc w/ stage 2 intercooler, Lt4 fueling, JMS BAP, lt2 intake, mamo ptb, kooks 1/78 longtube headers w/ h/f cats, alky meth kit, thpsi port injection
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