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IIRC, the downpipe and header flange end in the same place, are different sizes, but still bolts up
My RB TII catback was also bigger diameter as well and the flange was not in the same place.
RB DP --> smaller Diam N/A presilencer --> smaller diam N/A catback = has been done and works
Header --> bigger diam TII presilencer --> bigger diam TII catback = MAY work
Look at the different systems on the RB website. Only chance is with a TII presilencer and hope the studs line up to the header flange
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'15 Juke Nismo
'06 MX-5 GT SOLD
'04 S Silver RX-8 GT Track Day Use SOLD
'90 Black TII vert w/ Sprint RE stock port/turbo DD dyno (242.6whp@5500rpm @12psi 8psi@redline) and (250ftlbtq@4800rpm @13psi) SOLD
'89 GTUs 6p TII SOLD, '87 sport SOLD, '79 SA stock SOLD
'91 B2600i 4x4 w/ Rx-8 LSD SOLD
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