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Let's see.... you've done everything you can on the exhaust. Backpressure should be non-existent (not the best thing for torque, but you probably know that). You probably know there are other intakes available beyond the stock air box, but little, if any, gains could probably be expected from that. Further along the intake lines you could look at the new thing that Pedro is selling that mounts after the throttle body. There have also been bigger throttle bodies sold, but that doesn't seem to be a popular option.
Besides that there really isn't much for bolt-on, simple power options. Maybe an underdrive pulley would give you a little. A LWFW would make the engine more peppy. Other than that it looks like you're good to go for getting a tune on your car to squeeze out the last little bit that might be there.
Kirk
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2000 Boxster S - Gemballa body kit, GT3 front bumper, JRZ coilovers, lower stress bars
2003 911 Carrera 4S - TechArt body kit, TechArt coilovers, HRE wheels
1986 911 Carrera Targa - 3.2L, Euro pistons, 964 cams, steel slant nose widebody
1975 911S Targa - undergoing a full restoration and engine rebuild
Also In The Garage - '66 912, '69 912, '72 914 Chalon wide body, '73 914
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