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Looking for someone that can custom tune on BDX or give some insight on things the consumer can change, like timing at WOT or timing at certain RPM or gear etc. 03 silverado 4.8l cold air intake stock otherwise. with premium octane tune it has had no effect on this truck and has no balls anything under 4000rpm. it pulls the same on stock tune as well. should be able to wake up this little 293 (289) TIA!
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