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If a CAI is installed as the first mod, you will see dramatic gains. Same thing if you dyno after any "first mod". Everything else is incremental.
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Actually thats all James had done was the Gen 3 install and he had like 1hp gain from the last dyno peak and little to no gains throughout, again its due to the heat and humidity.
If the loss is 4% to 5% reasonably for the atmospheric changes, then we all should be right on the money for gains. 276whp with 4.5% added in would be about 288-289whp which makes sense for a full exhaust or Gen 3 install up from baseline of 276-277whp.
I'm not going to dyno again though until its a reasonable 80ish degrees, now that I got rid of that crap OEM muffler. It feels like the same gains I got with the X-Pipe added in again with straight through Magnaflows added and the rear muffler gone. Hoping for 285-290whp, it definately is fast now.