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LPE offers porting and polishing of the factory throttle body used on the LS1 & LS6 Corvette, Camaro, Firebird, GTO, CTS-V, 4.8,5.3,6.0, and the 8.1 GM trucks. This service is available on an exchange basis with a refundable core charge or by sending in your throttle body to be ported and returned to you with a 1-2 day turn around. Gains from this modification on most stock cubic inch applications would be comparable to installing a larger aftermarket throttle body at considerably less cost! This item is not legal for sale or use on California pollution controlled motor vehicles. IF YOU ARE NOT SENDING IN YOUR CORE, YOU MUST SELECT THE CORE CHARGE.