G pipe + cup = THE RESULTS!!
04-29-2007, 04:37 PM
#16
Three Wheelin'
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It may be different for you guys, but for my 965, no cat & no muffler (we only have one muffleer) is the best combo for power and torque. This has been confirmed by many 964 turbo owners. Noise is subjective, but most of us love the straight-through :-)
04-29-2007, 07:01 PM
#17
Burning Brakes
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Originally Posted by 911addict
It may be different for you guys, but for my 965, no cat & no muffler (we only have one muffleer) is the best combo for power and torque. This has been confirmed by many 964 turbo owners. Noise is subjective, but most of us love the straight-through :-)
04-29-2007, 07:04 PM
#18
Originally Posted by fstockcarrera
Jeff and I have done extensive dyno work there is absolutely no loss of power with Primary and secondary bypasses only INCREASES with stock headers. If you replace the cat with the europremuffler you will gain MORE POWER. These Engines need very little back pressure
Bob
Bob
05-01-2007, 06:35 AM
#20
Racer
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Originally Posted by Chris M.
The 964 Cups have no cat, no primary, and no secondary. I doubt Porsche would have done this if it made the engine lose power.
05-01-2007, 04:11 PM
#21
Rennlist Member
Geoffrey Ring of Racetek has all the dyno runs and could look up that info for you. I don't believe you lose torque until you substitute a straight pipe for a euro premuffler with all other by passes, and then it results in +3 RWHP and -3rwtg peak #'s 964 m64-01 engine
bob
bob
Originally Posted by rroobbcc
Bob, I assume the "power" in "MORE POWER" to mean HP, or were you referring to both HP and torque? Also, are you referring to peak numbers or across the entire rev range? My understanding has been that YES, you would see an increase in *peak* HP and torque while running a completely open exhaust. However, those increases would be realized primarily in the upper rev ranges and that low-end performance may actually decrease. As mentioned above by Wes, this would obviously be no issue for a race car as they are almost never plodding along below 3K RPMs. However, it may be noticable in a road car. I am open to evidence to the contrary, but your reply wasn't quite clear enough.
