Well I noticed a bit of a difference with just the SRI when I had that on.....but now that I put on the TIP....wow!!! what a difference...the throttle response is so much peppier now especially when shifting. Seemed to reduce that initial lag of response right after you shift. Even if the TIP took forever...it was definitely worth the wait. It was also good I put them on separately to see which piece made the most difference....of course it could just be the combination of the two, but I noticed more butt dyno power from the TIP. Thanks Ken for being patient with my annoying emails lol...back to work as I am on call unexpectedly at 3:30am (coffee)