FM2 2.5 vs 3.0 exhaust
#1
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FM2 2.5 vs 3.0 exhaust
Last December I upgraded my ~ 10 year old FM 2.5" exhaust to one of their new 3.0" ones. Finally got around to dynoing it yesterday, and both spools up faster and picked up 10 hp on the top end despite running slightly less boost (unfortunately, the setting on the boost controller wasn't identical between the two runs, it's down about 10 kpa which explains the lower torque in the midrange).
The car is a 99, has Carrillos & 9:1 Supertechs, headwork, FM2 hardware, Hydra, and a 2560. Stock 99 intake manifold. The first dyno was a couple years ago with about 200 miles on the motor, the second with about 5000. Both are DynaPacks, although different physical units.
--Ian
The car is a 99, has Carrillos & 9:1 Supertechs, headwork, FM2 hardware, Hydra, and a 2560. Stock 99 intake manifold. The first dyno was a couple years ago with about 200 miles on the motor, the second with about 5000. Both are DynaPacks, although different physical units.
--Ian
#3
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The butt dyno change was significant and I needed to retune the boost controller settings after installing the exhaust, so I think most of the effect is from the exhaust change.
The 3.0" exhaust is, as you would expect, quite a bit louder than the 2.5" as well.
--Ian
The 3.0" exhaust is, as you would expect, quite a bit louder than the 2.5" as well.
--Ian
#5
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How much difference did you find there to be in the noise level? Especially things like droning.
--Ian
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