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yeah. maybe its the exhaust? idk. i'm gonna see about getting will's or scott's stock exhaust, putting it on, then dyno'ing again. seeing if its any higher.
It will depend on weather conditions as well. With different weather conditions, it won't really tell you anything if you get a better or worse result from a stock exhaust.
When is the last time you've changed your air filter?
Good one. Sometimes it's the little things. After we installed Jason's filters yesterday he'll be lucky to get 450 hp...
Another "out in deep right field" thing to look at is gas. Did you have an ethanol blend in the tank? And the truly unlikely one is bad gas, did you load up at a Racetrak or other discount gas retailer?
I was just playing around but yes I was serious that your air filter was dirty. You need to chill when people say things. It's not like it was a personal attack on you about anything. All of us say things about others in this thread and no one gets pissed about it. Just chill. You no I wouldn't be a dick to you.