£5 says its the felt lining on the bonnet rubbing on the cover.
Samson yeah i got mine done there! running around 190 bhp and carnt remember torque ill have a look for it! it will be somewhere safe but stupid cos our lass has put it some where think its 280 (rings a bell for some reason) keep me informed with ya results! cos reading other threads people are getting better results!
Is that stock?
Mapped up you should be running 200 - 212bhp and 325+ lbs/ft torque

Regarding the scorch marks, my mk2 cupra has these on the engine....not much...but i can deffo see it.. should i take it back to the dealers to check out the lining?
Thats the first time i've heard of a standard fr putting out less than the quoted figure,they're normally over 180bhp.
Still, a useful gain achieved,hope you have fun testing it!