how much horsepower can the stock trasmission and axle and stuff take before i need to replace it? thanks

 

Stock tranny may or may not last with up to 450 RWHP. Make sure you use a cooler and have someone with edit skills that do not raise the line pressure too much!! Rear axle is the same.depending on whether you have an a4 or m6. m6's seem to tear up rear ends more often.

 

i'm planning on going up to 430hp to start with on a sc, so i just wanted to make sure the rest of the car would be fine with that

p.s. it is an a4, sry

 

Add the a4 to your sig I think the stock one as long as it is cooled and tuned correctly should last a while.