that's not a problem...go pay a visit to ur local garden centre and purchase a whole heap of crushed rock or sand and place it in ur boot. What the f**k is whole heap of sand or crushed rock is going to help i hear u ask.....well let me put it to u simple as simple as can be as simple as simple ABC simple, all that sand/rock u've put in ur boot will act as weight on ur rear wheels so when u go try doing 3.5 4000 rpm launch u will have minimum to nothing wheel spin. Tada problem solved.