It's very possible it just hasn't ever worked, I've only had the car since the end of May and I do sense a lower power level but only moderately so. So if I do put the Johnson pump on there and that was the case, I may end up pissing my pants the first time I drive it.

If you remember when I first got the car I lost a light to light race with a new Jaguar XF V8 and this could have been why.

Not sure if these pumps make noise or anything either butI certainly dont feel or hear anything.