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I second the suggestion of a K&N air filter. I felt the difference. Other things that I have done are -Mobil 1 oil (cleans up varnish), Volvo strut tower brace, IPD wiper relay (not performance but an improvement), IPD exhaust tip, cabin filter insert with filter, cross drilled front rotors (Zimmerman, no problems), added keyless entry removed flame trap, ignition coil (OEM), plugs, wires, cap, clean throttle body on time. That would keep you busy along with the other regular maintenance items. The na does vroom nicely, but is not meant to throw you back in your seat and beat 300 Hp, and every other car through the toll booths. It's possible that the jury is still out on the butterfly valve.
Have fun with it.
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'97 855na, Mobil 1, K&N, various IPD's and eBay's
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