it cant be just one thing
-veyron not properly tuned
-extreme mods in r35
-extreme fuel in r35 (fuel mixed with nitro) and NOS injections of high amounts
-slick tyres in r35
-not so good tyres of veyron
-veyron not being pushed to the proper limits
one thing is for sure how much or how ever the r35 is modded and what ever it has if its run on these like this for long it wont sustain it... while veyron will perform its best for as long as you want it to be... that is the difference in the efforts of bugati and these r35 modifiers