Originally Posted by mjgroves

Excellent feedback Mike. So in your opinion, did the tubes/horns help substantially? Can you feel any difference at all compared to the stock sl55 setup? It seems that you noticed no difference in sound/whine between the stock sl55 and the sl55 w/tvt tubes... is this true?

If it does provide even a little bit on the butt dyno, I might as well just buy the tubes/horns and install everything at once, rather than waiting. Hence, my questions...