How could I cut the weight down on my A6, but still keep the interior able to comfortably seat 5 adults?

 

You will need to get a custom carbon fiber company and carbon fiber your whole car. Or possible remove the cars AC or seat heaters? Could always take out the spare tire.. No real way other than carbon fiber, light rims, light tires... and getting to the ripping out the seats or just replace them...

I have been thinking about what I am going to do with weight once I get the max horse power out of my car... I am not big on gutting the car either :X hopefully I will find some ways. If I do I will let u know or if I carbon fiber my whole car I wil let u know