Looking for opinions from those who went from a 4.8is to the new 4.8i? 'm considering it and am wondering if people have been dissappointed or pleased with the 4.8i's performance relative to the 4.8is. Thanks. GBG

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'04 TT cab (x73, short shifter) and '04 X5 4.8is
'07 Escalade ESV