Optimum Back-Pressure for Exhaust Systems?
I have been playing with exhaust systems lately on my 2.7L 2000 Boxster. I have tried different combinations of Fabspeed Cat-Bypass Pipes, TTP headers, 100-Cell cats and both stock and Gemballa mufflers.
The car seems to like the stock header/Fabspeed Cat-Bypass/stock muffler combination pretty well (198 whp). But it runs and sounds best with TTP headers/100-cell cats/stock muffler (202 whp).
But what suprised me was that it did not like the TTP headers/100-cell cats/Gemballa muffler combination. I did not even run a dyno on the rig because it was not running well at all (also, that combination was too loud for my tastes).
The Gemballa muffler seemed like it had pretty free flow compared to the stock muffler, so it got me thinking about what the optimum back-pressure in the exhaust system is for the 2.7L engine.
Anyone have any ideas about what is the optimum back-pressure or exhaust is for this engine,
Cheers,
Ed
2000 2.7L Boxster, 50K
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