Ha! Yeah, but I think it's fair to say that you can tell if there's an improvement by SOP. If you can't tell there's a difference, the improvement probably wasn't a significant performance increase. I expect that a lot of the IC related stuff I plan on doing won't cause a noticeable improvement until there's a tune (increased boost); or, the effects will be only be noticeable when paired with an inlet change and intake pipe, etc etc.
Besides stage 0 prep, the only mods I've made are a custom 2.5" mandrel bent catback (quiet) system. Via SOP, that change has increased the mid - upper power band fairly significantly (maybe 10%). More than I thought it would have, actually. I've done lots of exhaust modification in the past and this is probably the most significant change I've experienced. Maybe because it's a turbo car, I'm not sure, but it's an encouraging beginning to my P1's mods. I'm aiming for around 300bhp after catback, pumaspeed inlet, snabb intake pipe, custom 2.5" IC hardpiping, larger Volvo FMIC, and elevate tune. Realistic?