well converted cars, not enough to feel, poorly converted cars, feel a bit flat and shit.

Depends if youre buying a shonky old spi kit that was jammed on 10 ears ago, or planning on buying a modern multipoint kit fitted properly and well maintained.

There is a noticeable difference for instance between my dads shonky £100 rover 600 with a single point aftermarket install, and my vectra sri factory dual fuel on a w plate.

nothing to worry about on a daily hack in any case