I can't comment on the speedtuningusa product, but can state that my chip did increase the overall performance of my car rather impressively. I recommend chipping in conjunction with making the engine breathe easier (both air input (a new air filter element) and output (a high flow exhaust of some sort)). If you do chip, definitely get an exhaust of some sort. My SuperSprint setup wasn't that much - $600 or so I think - and didn't make it too much louder (just a little throaty).
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1998 S70 T5M, Nordic Blue, iPD ECU/Strut Tower Brace/Anti-Sway bars, SuperSprint SS exhaust, Magnecore plug wires, K&N Filter Charger, Blackout Grill, European Side Marker Lamps, Two-Tone interior, 225/40 Series tires
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