Hks hi power silent exhaust question?
 

Will the Mazda trix 3" down pipe mate to the his fatback or will I need a test pipe?

I have this exhaust and originally had a RB DP. It requires a cat, pre silencer, test pipe, something to connect the DP to exhaust. So unless the Mazdatrix is two pieces, or obscenely long, you will need the same.

Great thanks. Do you have a 3" or 2.5" down pipe

3". I wasn't even aware there were 2.5" floating around, or that anyone would bother for that matter :)

they don't make it anymore but corksport had a really nice resonated test pipe. if you can find a used one i'd definitely recommend grabbing it. my exhaust sounds great with that and custom piping to an apexi muffler