Quote:
Originally Posted by Nz2ssrs
2011 ss l99 with longtube headers high flow cats, borla 2.5” cat backs and an over the radiator intake.
Hp seems down a little bit torque is up from most.
First test was all bolt ons no tune second was tuned. What do you think ?
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That does seem a bit low, 258kw is about 345whp. My stock 2015 L99 baselined at 355whp with no tune for reference (dyno sheet attached). I am right at sea level, but it doesn’t seem like it would make that drastic of a difference. I’m sure someone more knowledgeable will chime in.