Can anyone tell me the piping size for the HKS hiper exhaust? I was thinking of getting the Apex N1 but I can get a good deal on the hiper. Are they the same diameter size? Or should I just get a JDM spec 2.5" exhaust?

TypeRmSm-Mike, Will a 2.5" exhaust fit on the carsound cat (54006)?

If anyone can give me some input I would appreciate it.

 

Nobody?

 

I'm pretty sure the two are the same size but the N1 may be a little bit larger
The N1 is 60mm (2 3/8") Im not sure on the Hiper though
Yes the cat will fit no problem

 

thanks Mike

 

You will however have a mismatch of IDs. The cat ID is 2-1/2" and if that cat back is 60mm, it's ID will be 2-1/4".