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Wow did I see this correctly, you have a full akro system and dynoed a 339 and then someone else also with catless system (100 cats) did in the 330's as well? I honestly would simply guess 2010 had a run of weak cars, or else you both babied the car too much during break in-but even that really should not explain this low of numbers.
Most bone stockers are hitting 350. Mine was a 351 like the average. With xpipe/HFC and AA and 95 octane was at 381.
I think unfortunately you should got a weak horse out of the factory. Just like some are stronger. All luck of the draw. Unliekly you will ever notice though but I know mentally it still sucks.
Try getting an AA filter, some race fuel to increase octane to atleast 95 by mixing with 91/93 and give it a whirl again. If you do no tbreak 355 there is clearly just something weak about the engine
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