I have a RB HEader 2 into one and a borla cat back all 2 1/2 inch What should i put in the middle i might have room for a RB pre silencer might have to mod somthing, would a stight pipe be really f-ing loud?

Thanks for all the help I know i have been asking alot of questions but with half my motor in pices i need as much help as i can get

 

it would be pretty loud with a test pipe. Id recommend a pre silencer but it comes down to personal taste. If you like attention go with a straight pipe, if not, presilencer.