i have ran both my previous
ibiza 8v and now my current 16v with no spare wheel (space savers are not very pleasant, I use a can of tyre weld) and no back seats/plastics. does feel a fair bit nippier, especially on corners and braking! more so on the 16v cos it doesn't have as much torque as my 8v did. although the 8v wasn't too loud, for some reason my valver has a lot more road noise and the exhaust is a lot raspier/louder too.