Scope pics and results
 

Using a good oscilloscope and a 1k test tone, amp hooked up to a 4 ohm(3.4 to be technical) resistive load I safely pulled 279 watts off the Arc 600.4 bridged. I was able to pull more but played on safe side. This is head unit at 33 of 35. Test yielded the Kenwood does not clip at all at max except at 35 on CD mode. At 34 it was close. On USB the preout level was only around 2 volts rms. In CD it didn't produce 4 till 33 on volume.
BAD
https://cimg4.ibsrv.net/gimg/www.hdf...898a0776b5.jpg

GOOD
https://cimg5.ibsrv.net/gimg/www.hdf...695bea67b6.jpg
Load

https://cimg6.ibsrv.net/gimg/www.hdf...aad99bd81a.jpg

Now there's something you don't see every day! Excellent job Slye!

Thanks turned out well. Power wise I may need to back off a tad. Didn't expect the subwoofer to play the 1k tone. I was wrong. About made my ears bleed. Seems to be close. Have some tinkering to do and need to double check couple things under fairing again and I am calling it good.