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LT1's respond fine to bolt on's. There's been one guy to run in the 11.9X range at about 111 bolt on only. Most usually run between 12.5-13.5 with bolt on's depending on state of suspension and traction.
Don't get sucked into the LT's own all frame of mind. There's PLENTY of Mid-length header designs out there that maintain your emissions compliance and make just as good power. ASM's all the way!!!
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