Hey i just got my SSAC headers in today and am ordering a new flex pipe from zzp for them. Im on zzp right now and see the interlock flex pipe is only 15 bucks. The thing is i don't know what size to buy ? They have 42mm, 2 inch, 2.5 inch, and 3 inch. What size flex pipe will fit best for the SSAC headers ? Thanks ! I'm pretty sure the 42mm will fit best but for some reason im second guessing myself.