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First tune up and maintenance. How old are your plugs, wires, cap&rotor. How is the timing...you get the idea. I recently replaced my O2 sensor and noticed a significant improvement in idle quality and midrange power.
Make sure your air filter thermostat is functioning properly or better yet, remove it for cold only air intake. You can also consider the electric fan conversion. Neither will make the car a screamer but should give it just a bit more oomph. Both have been covered in this forum and in the aftermarket forum.
Try www.turbobricks.com or www.volvospeed.com for more ideas.
I'm waiting for an Enem V15 cam. That should make for a fun upgrade!
mormit
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85 245DL 'The World's Fastest Production Tank' 02 S40
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