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SOLVED! Thank you Whitestripes! Okey so as I wrote earlier, it turns out that the lower vacuum hose from the Bypass Valve was completely blocked off by being "connected" to this here(1st pic). And this threw me: P0455, P0457 & the "Check Fuel Cap" light. I unplugged the vacuum line to ambient...

I did some looking into my bypass valve and it turned out that my lower vacuum line was blocked off, when it is supposed to go to ambient pressure? I removed the cap and had no issues on a short test drive. I will have to drive some more to be sure, but it's looking good so far! Fingers crossed.

Oh that sucks! Well thank you for the great info anyway, truly appreciate it!

Where did this PDF go? Can someone send it to me? https://www.svtperformance.com/forums/threads/03-04-cobra-vacuum-lines-documented.733504/#post-15593026

Thanks for the reply. I havent figured it out yet. I'll have to check the bypass valve.

I have a strange issue with my 03 cobra. About 50% of the time the boost only goes up to about half of what it's supposed to, and the car seems to sound more muffled when it acts up. The only mods I have are; a pulley, intake & exhaust. Changed sparkplugs / oilfilter / oil / cleaned airfilter...