RE: exhaust power increase
 

i have installed the fmf powercore s, i feel no gain in power, but i really feel how the titanium slipon changed the handling. my rubber was more ate from the left side and the left corners were easier to do, now i feel much lighter right side and do the right turns with more pleasure. sorry for bad english.

RE: exhaust power increase
 

you wont "feel" any gains until you start getting the whole package and other supporting mods...full system, PCIII, air filter (something similar to BMC; K&N is whatever), driving parts like a 520 conversion with more aggressive gearing, ignition module, etc. etc. etc...remember that powers not only limited to the engine...its mostly "felt" when the power you already have is transferred to the ground more efficiently (i.e. -1/+2 w/ 520)...

so to answer your question, no, the slip on wont to anything noticeable...