Mike, if by boot you mean the part between the MAF and the throttle body, the only reason you'd need a new one is if you have a 99-00 and you switch to the 90mm MAF, that comes with the matching boot. Our filter kit attaches to the MAF.
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SAL- Power Surge Performance
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01 Lightning
99 Lightning
95 Lighnting
91 SHO Plus (can't drive Lightnings every day)