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well today after having my 5" exhaust on, had to try 'er out a little bit. Put the Juice in #4 and did a couple of nice runs .. shift from 1-2 and 2-3 were VERY sluggish and barely felt it.
Guess it's time to do the Sonnax. But I think i'm gonna let someone else do it. Something with that many valves and springs scares me. I'm a paramedic, so the best analogy is that I wouldn't mind taking care of fractures, hell even minor surgery, but I'm not gonna do brain surgery !
i have the sonnax, and yes i would recommend the BTS valve body over it. have never been in or drove a truck with a valve body, but the ones that have upgraded from a sonnax to a BTS VB (cat_man_963 in particular) love theirs. i will let them take over now.