i dont know witch donw pipe to use. what are your thoughts. thanks

why is the HKS angled like this http://66.216.67.51/product.asp?0=210&1=254&3=301

whats the difference between these two..one is a lot more the than other http://66.216.67.51/product.asp?0=210&1=254&3=585

http://66.216.67.51/product.asp?0=210&1=254&3=292

thanks. i am looking for a 3in dp

 

i choose racing beat but thats me. but if i were you i would go 3in all the way back not just a 3in dp and then 2.5in pip the rest of the way