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Old 02-25-2015, 09:51 AM   #5
K5owner
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Join Date: Mar 2014
Location: CA
Posts: 168
Re: get more tourq out 454

Heads. Cam profiles in tbi applications are very mild so that the ecu can account for them and most chips or tunes are not emissions legal. I would find better heads or port what you have and look into perhaps a good set of headers.
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