foam under tank
 

why is there foam under my curvy tank?

To deaden the induction noise

does it make much difference if you remove it

Nope :) But, if you've got a free-flowing filter fitted it can help remove airflow restriction, much like tank spacers. And it prevents the risk of it falling off and blocking your filter, as sometimes happens :)

It's 50 grammes of excess weight get rid of it!

BUT THE SPACERS WILL WEIGH MORE THAN THAT :cry:

Then eat more roughage...

Ah, but then you could fit titanium bolts to offset that :)

so if i remove the foam & lift the front of the tank by 15-20mm will it sound better?

Dunno really, I've changed too much other stuff to say. You could buy the used Renegade airkit that's on EBay, I thought it sounded rubbish but I'm in a minority ;) It's £25 at the moment, bargain...