Header differences

hecmanortiz · 05-13-2011, 05:55 PM

I noticed on the Mazdatrix site that there are several(5 I think) different headers for 12A engines. How much of a difference is there really between the years and transmissions? I have an '85 with manual transmission and rats nest removed. Would there be a problem with a header from another year/transmission setup?

Thanks,
Hector

RX-7 Chris · 05-16-2011, 11:42 AM

You should just get the 16012 or 16125 header depending on if you want the single out or the dual out.

hecmanortiz · 05-16-2011, 09:07 PM

Thanks Chris, I was just wondering cause I just bought a used one off Ebay that came off a 12A and it wasn't specified. I thought the 12A headers would be the same till I checked at Mazdatrix. Other than O2 sensors I don't know what else would be different between the generations. Oh well we'll see when it gets here may be some wires and bungee cords holding it up.

j9fd3s · 05-31-2011, 02:57 PM

the 79-80 header will have a different flange and uses a different presilencer than the other headers, as the 79 "cat back", actually heat exchanger back, is a different length than the 81-85 systems.

i have no idea why there is a different header for 81-83 and 84-85. they all use the same size presilencer...

notice the road race header is 79-85, the difference in the others must be small

mike

sgt.stinkfist · 07-03-2011, 02:42 AM

its all in how the header/presilencer collects with the stock mid pipe which most RB exhausts reuse, and the hanger mount. for the road/race dual out header, it doesnt matter... one header fits all in that case, as it uses a different dual center section and RB's muffler for the '82 chassis w/ the dual inlet

05-13-2011, 05:55 PM	#1
hecmanortiz Rotary Fan in Training Join Date: Aug 2009 Location: Hamilton, Ohio iTrader: (0) Posts: 40 Rep Power: 0	Header differences I noticed on the Mazdatrix site that there are several(5 I think) different headers for 12A engines. How much of a difference is there really between the years and transmissions? I have an '85 with manual transmission and rats nest removed. Would there be a problem with a header from another year/transmission setup? Thanks, Hector

05-16-2011, 11:42 AM	#2
RX-7 Chris Rotary Fanatic Join Date: Mar 2008 Location: Colorado Springs, CO iTrader: (2) Posts: 132 Rep Power: 17	You should just get the 16012 or 16125 header depending on if you want the single out or the dual out. __________________ http://coloradomazdaclub.com 1984 RX-7 GSL-SE 1983 RX-7 GSL PARTING OUT + EXTRA 1964 Ford Galaxie 500XL 390 auto 1970 Ford F250 4x2 390 4bl C6

07-03-2011, 02:42 AM	#5
sgt.stinkfist The Newbie Join Date: Jun 2011 iTrader: (0) Posts: 16 Rep Power: 0	its all in how the header/presilencer collects with the stock mid pipe which most RB exhausts reuse, and the hanger mount. for the road/race dual out header, it doesnt matter... one header fits all in that case, as it uses a different dual center section and RB's muffler for the '82 chassis w/ the dual inlet __________________ 82 GS- GSL rearend, ported S4 13b, MSD 6AL, walbro 255, 460/550cc injectors, 2" dual exhaust, 3 row aluminum radiator w/ taurus E-fan 85 20v ST AE86 - sold to fund the 82 86 RX-7 GXL - donating parts to the 82 everything else - scrapped to fund the 82

05-16-2011, 09:07 PM	#3
hecmanortiz Rotary Fan in Training Join Date: Aug 2009 Location: Hamilton, Ohio iTrader: (0) Posts: 40 Rep Power: 0	Thanks Chris, I was just wondering cause I just bought a used one off Ebay that came off a 12A and it wasn't specified. I thought the 12A headers would be the same till I checked at Mazdatrix. Other than O2 sensors I don't know what else would be different between the generations. Oh well we'll see when it gets here may be some wires and bungee cords holding it up.

05-31-2011, 02:57 PM	#4
j9fd3s Rotary Fanatic Join Date: Mar 2008 iTrader: (0) Posts: 123 Rep Power: 17	the 79-80 header will have a different flange and uses a different presilencer than the other headers, as the 79 "cat back", actually heat exchanger back, is a different length than the 81-85 systems. i have no idea why there is a different header for 81-83 and 84-85. they all use the same size presilencer... notice the road race header is 79-85, the difference in the others must be small mike