Tom, quite seriously if you can pick up a stock stivo exhaust, do it!!!! yes .. do it .. if I had my time again I would have gone down this route !! why?? $$ v power ... and this is just my opinion ... I dont feel that there would be any significant difference .. either way .. weather I had a stivo exhaust or the x force .... so on that point the stivo exhaust is at a better price point .. also I think that it would be quieter ... and not that I dont enjoy the noise .. i love it ... just that ever so slightly would be good ... ( this point is debateable as if I had a stivo exhaust i may still want it louder !... and lastly I reckon if I had a stivo exhaust I would be able to lower my car and still get up the drive way ... some thing I cant do at the moment !!! hope that makes some kinda sense Fair enough! Im happy with the system. Works well on my rolla!