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Trifecta tune is like the custom tune TSS has but the good thing about custom tunes is you can pull back on stuff too. The LS4 in the SS is known for chewing up and spitting out trannys lol. With a custom tune you can just change your shift points instead of firming up the shifts or vice versa. It's your choice with custom tunes. Just my 2 cents.:beer:
 
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