re-tune?
#4
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At a minimum I would put it on the dyno with a wide band to make sure your AFR is still good and safe. Here is the GMHTP article where they added headers to a GTO with a vortech and it picked up 50hp:
http://www.gmhightechperformance.com...ion/index.html
http://www.gmhightechperformance.com...ion/index.html