Still not sure why you're not happy with the gain with just a catback. Like everyone else has said don't get cought up in numbers . I make 287 WHP on what I'm being told now is a inconsistent machine ( mustang) Al tho it's the lowest machine around and I sont mine that.
Just for you're arguments sake I went to another shop to get some pulls done becaue the place I use was booked and I made a WHOPPINH 252 WHP ! So did I really go backwards from stock ( 265 ish) no the machine was differnt and actually found out later was set up wrong. Numbers are number that's it dyno's are a tunning tool and not bragging rights. Yes it would have been great to see a higher numbers but the numbers you got are just that numbers . Be happy and keep modding . You can use the same dyno just compare the gains and not the end WHP .
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14 Q50 AWD, ARK, ECUTEK (SEB), Takda, 
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