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| Gary Bossert Summary of S14 Headers |
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Originally posted to the E30 M3 SIG |
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At 07:01 PM 5/17/2000 -0400, Andrew Taylor wrote: >Intereresting tidbit. The 2.0L header (1 piece) off the italian 320is >has larger runners than the 2 piece rally header, the collectors are the >same size as the 2piece rally header. > >Also the 2 piece rally header's collectors are larger than the stock 2.3 >by 3.6mm. (stock is 1.675", rally is 1.825") Sounds right. It's interesting that Will is calling the 2 piece unit a rally header when the real rally header is one piece. The one Will sells is the race header I believe. >Gary Bossert wrote: > > > > Greg, > > If I remember correctly...... > > 2.3 Grp. A (2 piece) header: > > Large runners, smaller collectors > > Most often in stainless steel. > > Rally (1 piece) header: > > Smaller runners, Large collectors > > 2.5 Evo/2.5 Grp.A (1 piece) header: > > Large runners, Large collectors. > > This one has the wider spacing of the tubes at the bottom flange > > in order to bolt to the Evo 3 exhaust. > > 2.5 DTM header: > > Huge and $. > > Note, the stock 2.3 header has smaller runners and collectors than all of > > the above. > > Some of these will need to be drilled and have a bung welded in place for > > the Oxygen sensor. > > Every one of the above headers is an upgrade, the Rally version will lose > > the least bottom end performance. > > If my notes on this are wrong, let me know. At one time I had an example > > of each of these in my possession to make the comparison. > > > > HTH, > > Gary Bossert > > > > At 02:45 PM 5/17/00 -0700, Greg Coffeng wrote: > > >Gruppe, > > > > > >Anyone out there have a rally header on a 2.3L motor? > > >How much of a difference did you notice? I am thinking > > >of adding one to my engine. I want to improve the higher > > >rpm performance. > > > > > >FWIW, I plan on keeping the car streetable (passing CA smog > > >tests) but I will use the car regularly at track events and > > >schools (but no racing ... I know, I'm a wimp). > > > > > >All responses appreciated, > > > > > >TIA, > > >-Greg > > >1990 M3 (getting a new head gasket) |
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